Tools

Free stand-alone auto-rigger for bipeds (and some creature proportions). Export FBX/USD for Unity, Unreal, Blender, etc. Best when the mesh is 100% your own.

Community C++ port of Advanced Locomotion System V4 for Unreal Engine: a third-person character locomotion framework with stances, gaits, rotation modes, mantling, ragdoll and footstep handling, rebuilt as a replicate…

Muse Group's audio editor (3.7.8 on 2026-08-24). GitHub LICENSE.txt: the app is GPLv3; many files are GPLv2-or-later; docs are CC-BY 3.0. FAQ: it "will always remain free". Windows/macOS installers push MuseHub; "Down…

Apache 2.0 GPU texture transcoder / supercompression (often paired with KTX2). Standard for shipping compressed textures across devices.

Behavior tree addon for Godot 4 that gives enemy and NPC logic a visible structure instead of a growing pile of state booleans. Trees are built as node hierarchies in the scene tree, so composites, decorators, and lea…

Browser-based chiptune sequencer. A song is stored in the page URL, so sharing a link shares the song. An offline version is offered for download, and the source is MIT.

increpare's browser sfxr descendant (current app is Bfxr2 in JavaScript). More parameters than jsfxr, plus a port of obiwannabe's footstep generator. Use it when ChipTone's CC0 output grant is what you wanted and jsfx…

Free 3D DCC (model, UV, rig, animate, simulate). Listed here because GTA-format add-ons such as Sollumz require Blender 4.0+, and the catalog had no blender.org tool entry. Software is GNU GPL. Artwork you make in it …

Lightweight low-poly modeling / UV / animation editor. Ideal companion to Kenney/KayKit style pipelines. Homepage: free for any project, open source under GPL. GitHub SPDX is GPL-3.0. Tool license is not the license o…

Beginner-friendly pattern sequencer for writing game music, a Godot-based port of Terry Cavanagh's Bosca Ceoil by Yuri Sizov. This is the maintained line: the original TerryCavanagh/boscaceoil repository is archived o…

Blender's long-standing fracture tool, now distributed as an official extension. Select a mesh, run Cell Fracture, and it splits the object into convex pieces, which is how most pre-broken debris for games is made. Se…

Qt sprite atlas packer built on an aggressive MaxRects bin-packing heuristic, with a GUI and a command-line mode (crop, merge duplicates, rotate, extrude, square atlases). It writes a PNG atlas plus a plain-text .atla…

SFBGames HTML5 (plus Windows/Mac) sound-effect generator in the sfxr/Bfxr family, with a sampler and sequencer still in development. Use it when jsfxr's one-shot oscillator is too thin. The itch page grants CC0 on sou…

Point-cloud / mesh tool for lidar cleanup, alignment, and sampling down to something an engine can swallow. Download page: "Free as in Free speech". Wiki License page: CCLib (core algorithms) is LGPL 2.0 and "can be i…

ETH Zurich / UNC Chapel Hill Structure-from-Motion and Multi-View Stereo pipeline with a GUI, CLI, and PyCOLMAP. Same job as Meshroom: photos in, sparse cameras plus dense mesh/point cloud out. The library is the "new…

Free full-screen colorblindness simulator (Windows/Mac/Linux) for deuteranopia/protanopia/tritanopia checks. Design-time a11y tool, not an in-game filter.

Godot plugin/runtime for Creature mesh-deformation 2D animation. Apache 2.0 for users without a paid Creature editor license (Creature owners get a separate more permissive runtime license). Editor is paid — this entr…

BSD-2-Clause desktop color-vision-deficiency simulator/filter. Free commercial use with copyright notice retained. Cross-check UI contrast with Chroma/Color Oracle workflows.

Visual dialogue and timeline editor for Godot. Useful for in-game notifications, tickets, or narrative UI without building a dialogue system from scratch. Dialogic 2 requires at least Godot 4.5. Keep the MIT notice if…

Dialogue plugin for Unreal Engine with its own graph editor: each dialogue is an asset of linked speech and choice nodes, with conditions, events and per-participant variables wired in the graph. Full Blueprint and C+…

Maintained fork of FamiTracker, the classic NES and Famicom tracker. The GitHub description calls it "modifications and improvements for 0CC-FamiTracker". Use it if you want the FamiTracker workflow and module format …

Formant (robotic) TTS for 100+ languages. Useful for placeholder VO, accessibility debug lines, and tiny footprints where neural models are overkill. The program is GPL-3.0 or later (COPYING). GitHub README also notes…

Sprite sheet packer by z64me. Point it at a folder and it packs, trims, rotates, pads and de-duplicates sprites, reads animated GIF and WebP, detects pivot points, and lets you write your own export modules. The v1.0.…

NES and Famicom music editor with a piano-roll interface instead of a tracker grid, so it is easier for people who don't read tracker columns. It covers the 2A03 and the expansion audio chips. It exports WAV, MP3 and …

Design-agnostic node editor for scripting the flow of events in Unreal Engine: quests, story beats, level events and anything else that is a sequence of things waiting on other things. Each node is a UObject that bund…

Audio middleware with a Free Indie License for small developers: under $200k USD revenue per year, on a project under $600k development budget. Above that, per-game fees apply. Every licence level requires an in-app c…

Blender-to-Godot pipeline from Papercraft Games. You tag objects in a Blender side panel as characters, players, triggers, speakers, physics bodies or holdable items, and set scene metadata. Then you add one FoldedPap…

Tim Day's Qt/OpenGL application that generates random fractal planets and terrain with oceans, mountains, ice caps and rivers, then exports them to POV-Ray or to Blender. Source-only release (0.4.0 tarball); you build…

Open-source sprite atlas packer (web UI, Electron desktop, Godot/Unity/Phaser JSON). The old apex free-tex-packer.com is a "Loading..." shell on 2026-08-24; a follow-through host is not the app. Use the GitHub repo. L…

Godot 4 add-on that imports Quake .map files, as written by trenchbroom, into Godot scenes with meshes, collision and entities. It is the usual bridge for building Godot levels in TrenchBroom.

Multi-system chiptune tracker that emulates a long list of sound chips (Yamaha FM, AY/YM, SN76489, SNES, Amiga, PC Engine and many more). It is the tool for music that has to sound like a specific retro console or arc…

Godot Unified Input Detection Engine. Structured input mapping and remapping for Godot 4. Helpful for controller configs and Steam Deck-friendly rebinding. Bundled prompt icons are Xelu's CC0 set (separate from the MI…

QuadSpinner terrain tool with a free download on the product site. The free Community Edition is non-commercial only. That covers the program and the terrain you export from it: the EULA bundled with the current relea…

Community guide to Unreal Engine's Gameplay Ability System plugin, with a small multiplayer sample project that implements the concepts it describes. The README covers the Ability System Component, attributes, gamepla…

Desktop front end for the libGDX TexturePacker by Crashinvaders. It manages several atlases in one project file, exposes the packer settings visually, and has a headless batch mode for CI. It can also compress PNG/JPE…

GNU Image Manipulation Program: free raster editor for photo work, compositing, and texture authoring. This was the missing general-purpose raster tool beside Krita (painting-first) and Pixelorama (pixel-art-first). T…

MIT CLI/API for validating, compressing, and optimizing glTF/GLB (textures, meshes, instancing). Standard pipeline tool for web/mobile budgets.

GDScript add-on that replaces an intact mesh with a pre-broken ("segmented") version of it at the moment of destruction, turning each fragment into a rigid body. It does not break meshes itself: you supply the fragmen…

Free 2D and 3D game engine and editor under the MIT licence. The Godot add-ons in this folder (Phantom Camera, Dialogic, Terrain3D and the rest) all run inside it, and its Asset Library is the distribution point for m…

Lightweight Godot input utility by Nathan Hoad: device swap detection, prompt helpers, and gamepad rumble. Smaller than G.U.I.D.E. Keep the MIT notice if you redistribute the addon sources.

Community mod-loading framework for Godot. Wiki: wiki.godotmodding.com. The loader is released under CC0 1.0, so there is no notice to carry and nothing to credit.

Godot 4.1+ add-on that imports MagicaVoxel .vox files and destroys them voxel by voxel, with debris. The voxel alternative to mesh fracture: if your art is already voxels, damage is exact and there are no pre-broken p…

GDExtension bindings to Steamworks for Godot 4 (achievements, stats, leaderboards, etc.). Docs/home: godotsteam.com. The add-on itself is MIT. Steamworks is a separate matter: using it at all needs a Steam partner acc…

Apache-2.0 mesh/point-cloud compression used widely with glTF KHR_draco_mesh_compression. Commercial OK; retain Apache notice.

Open-source voxel editor (Windows, Mac, Linux, iOS, Android) with sparse unlimited scenes, layers, and export to MagicaVoxel, glTF, OBJ, PLY. This is the GPL alternative to MagicaVoxel's custom freeware. The program i…

Long-running Windows sprite and pixel-art editor from HUMANBALANCE, with layers, onion skinning, real-time animation preview, palette tools and sprite-sheet or GIF export. It was paid software until June 2017 and has …

macOS GUI for pngquant, pngnq and posterizer by Kornel Lesiński. It converts 24-bit PNGs to much smaller 8-bit palette PNGs while keeping full alpha, with a live preview against different backgrounds so you can pick t…

Free vector editor with native SVG as its working format, which makes it the natural companion to the SVG icon sets already in this catalog. Useful for recoloring and recombining icons, authoring resolution-independen…

Interactive field-aligned remesher from Jakob / Tarini / Panozzo / Sorkine-Hornung (SIGGRAPH Asia 2015). The job it closes here is turning dense scans or sculpt dumps into a quad-ish mesh you can actually UV and skin.…

Browser-based sound effect generator by Thomas ten Cate. It started from the sfxr/Bfxr idea and exposes more synthesis controls: amplitude, pitch, tone and filters, with presets and a mutate button. It exports WAV. It…

Browser port of DrPetter's sfxr, the 8-bit sound effect generator. Press a category button (pickup, laser, explosion, powerup, hit, jump, blip), get a usable retro SFX, tweak the oscillator and envelope sliders, expor…

Lightweight bone physics for Unreal Engine: an AnimGraph node that adds secondary motion to hair, skirts, tails, ears and accessories without setting up a Physics Asset or a cloth simulation. It is a pseudo-physics so…

Lightweight neural TTS. Hugging Face model card lists Apache-2.0 and calls the weights Apache-licensed. Prefer over non-commercial cloud free tiers. Steam/player-facing AI disclosure may still apply. See docs/ai-asset…

Free, cross-platform raster painting application built for illustration, concept art, and texture work. Fills the gap left by paid painting tools: full 16/32-bit float channels, a wrap-around canvas mode for seamless …

Khronos tools/SDK for KTX/KTX2 containers. Works with Basis Universal supercompression. Project SPDX is Apache-2.0, but the tree is mixed. lib/etcdec.cxx is not open source (Ericsson terms in that file).

2D level editor (Deepnight / Dead Cells director) with entity/layer workflows and JSON export. Free and MIT. The editor license is not a license on your level content.

Animated sprite editor forked from the last GPLv2 commit of Aseprite. This is the Aseprite-compatible FOSS path when you want .ase workflows without Aseprite's proprietary license. The program is GPL-2.0. The GitHub d…

Behavior trees plus hierarchical state machines for Godot 4, shipped as a GDExtension with a dedicated editor panel and its own debugger. The combination is the point: a state machine handles coarse modes such as patr…

Cross-platform DAW (Windows, Linux, macOS) with piano roll, mixer, built-in synths, LADSPA/VST, and SoundFont2. This is the missing tracker-adjacent music tool next to tenacity, which only edits samples. The applicati…

Node-based procedural PBR / texture authoring. FOSS alternative pathway to Substance-style graphs. Homepage calls it open source; the GitHub LICENSE.md is MIT. That is the editor license, not a blanket license on ever…

Standalone Bounding Box Software tool that builds a PBR set from a photo: height, metallic, smoothness, normal, occlusion, plus seamless tiling. Used on the Uncharted Collection remaster for metallic/smoothness/AO. Th…

MIT multilingual neural TTS (MyShell / MIT lineage). README states free for commercial and non-commercial use. Keep MIT notice; verify any bundled checkpoint provenance before shipping.

ISTI-CNR Visual Computing Lab editor for triangle meshes: cleanup, hole fill, simplification, remesh, glTF/3MF I/O. This is the scan-repair step after a photogrammetry dump and before instant-meshes. The application i…

MIT mesh optimization and compression (vertex cache, simplification, glTF tooling). Pairs with glTF-Transform. Keep the MIT notice if you redistribute the library sources.

Node-based photogrammetry GUI on the AliceVision library. You point it at a photo set and get a sparse/dense reconstruction and a mesh. That is the gap Instant Meshes and MeshLab do not close: they clean a mesh, they …

Open-source tracker modelled on Fasttracker II, for XM and MOD music. It will feel familiar to anyone from the 90s demoscene. Module files are small and several game audio libraries play them directly, which still sui…

Dialogue plugin for Unreal Engine with its own dialogue tree graph editor and a validation system that flags broken graphs before runtime. Per-node Decorators, written in Blueprint, trigger side effects such as cutsce…

Paint program that enforces the colour limits of 8-bit and 16-bit machines: Commodore 64, Plus/4 and VIC-20, ZX Spectrum, MSX, Amstrad CPC, Amiga, Atari ST and others. It emulates colour clash, and it exports native f…

Browser-based generator for space nebula backgrounds. It raymarches a 3D volume of gas and dust on your GPU rather than colouring 2D noise, with sliders, a randomise button and PNG export. Nothing is uploaded and ther…

Small Java editor for hand painting normal maps for 2D sprites. Instead of picking a normal colour and then painting it, you steer the direction with the tilt of a tablet pen or a gamepad stick while you draw, and a b…

Free 2D level editor with tile, grid, decal and entity layers. Levels save as plain JSON, so any engine can read them with a small loader. The Community Edition on GitHub is the maintained line of the project.

BSD-3-Clause multi-format 3D importer/converter for pipeline glue (FBX→glTF, etc.). Commercial redistribution OK with copyright notice; don’t use “assimp” name to endorse products.

Open ModPlug Tracker: a Windows module tracker (MOD, XM, S3M, IT and more) with VST plugin and ASIO support. Runs on Windows 7 or later, or under Wine. Its playback library, libopenmpt, is the usual way to play tracke…

Full production 2D animation suite, open-sourced by DWANGO from the Toonz software used in studio animation work. Covers drawing, scanning and cleanup, timing (Xsheet), effects and compositing. Heavier than pencil2d, …

Converts OpenStreetMap into textured 3D (glTF/glb/OBJ). Tool is MIT; OSM geodata remains ODbL — credit OSM and handle Derivative Database rules if you redistribute edited map data.

Windows image editor that started as a free replacement for Microsoft Paint and grew into a layered editor with effects and a large plugin ecosystem. It is lighter than GIMP or Krita, and many texture and UI workflows…

Single-page browser tool that pulls the palette out of a sprite, tileset or photo. It lists exact colours for pixel art or median-cut reduces a photo to a set size. It exports a .gpl palette for Aseprite, GIMP, Krita …

Half-Life 2 style first-person movement for Unreal Engine, written in C++ by the Project Borealis team. It replaces the default character movement feel with classic Source-engine behaviour: air strafing, bunny hopping…

Small, simple frame-by-frame animation program with raster and vector layers, for hand-drawn sprite animation and animatics. Runs on Windows, macOS, Linux and FreeBSD.

Godot 4 camera addon (Cinemachine-inspired) for target tracking, transitions, and cinematic shake. Useful during destruction and impact feedback. Keep the MIT notice if you redistribute the addon sources.

MIT fork of archived rhasspy/piper — local neural TTS (JA/EN/ZH/KO/ES/FR/PT/SV) without espeak-ng, positioned for commercial/embedded use. Prefer over GPL piper1-gpl when shipping closed-source games.

Free browser-based editor for animated sprites and pixel art, with a live animation preview, onion skinning and layers. It exports animated GIFs, PNG sprite sheets or ZIPs of frames. It runs locally in the browser wit…

Node-based editor by MakhamDev for procedural pixel-art effects and animation: particles, explosions, shaders and sprite processing built as node graphs. The source is MIT on GitHub. The ready-built Windows, macOS and…

Open-source pixel art and animation editor with tileset-oriented features. MIT. The editor license is not a license on the sprites you paint.

Windows (.NET 4.0) freeware by Benjamin Hollis that runs PNGOUT, OptiPNG and DeflOpt over a batch of images to produce the smallest lossless PNGs, and converts JPG, GIF, TIFF and BMP to PNG. Version 3.1.2 is still dow…

Qt front end for pngquant by nukesaq88: drop a folder of PNGs, pick colour count and speed, and batch-convert them to 8-bit palette PNGs with alpha. Pre-built binaries for Windows and macOS are on the project homepage…

Crowdsourced UI/menu string translations for indie games. The live Google Sheet states CC0, commercial use, and no required credit.

Godot 4 MIT scatter addon for procedural 3D prop and foliage placement (modifier-stack style). Keep the MIT notice if you redistribute the addon sources. The addon license is not a license on the meshes you scatter.

Huang / Zhou / Niessner / Shewchuk / Guibas quadrangulation (SIGGRAPH 2018). Same production need as Instant Meshes: turn a triangle dump into quads you can UV. The README says MIT. LICENSE.txt is a BSD-3-Clause text,…

ASCII and ANSI art editor from Grid Sage Games, the studio behind Cogmind. It was built as an in-house tool for roguelike development. Use it for character-cell maps, UI layouts and mockups, with layers, palette swaps…

A minimalist, keyboard-driven pixel art editor written in Rust by Alexis Sellier (cloudhead), with vi-style commands, a command line and multi-frame sprite views. It suits artists who prefer typing commands to clickin…

Godot 4 MIT 2D scatter addon (HungryProton fork by Alessandro Rasulo) — shapes / TileMapLayer–oriented placement for foliage, props, etc.

DrPetter's original 2007 Ludum Dare sound-effect generator (win32 zip + SDL tarball). This is the ancestor of jsfxr, bfxr, and chiptone. Project page: source is MIT, "free to use it for anything you please". That sent…

Local ONNX runtime for TTS + ASR (and VAD/diarization) across desktop/mobile/WASM. Apache-2.0 toolkit — commercial OK. Check per-voice/model licenses when bundling Piper/Matcha/etc. checkpoints.

Apache-2.0 color-blindness simulator (Mac screen filter + iOS camera). Design/playtest tool — not shipped in-game. Complements ubisoft-chroma / daltonlens.

Godot 4 addon for textured 2D polygons: place points, assign a shape material, get terrain-style edges without building a TileMap for every contour. Closes the 2D-terrain gap next to Scatter2D (foliage placement) and …

Browser-based bitmap font generator (SnowBamboo BMF). Load a TTF/OTF/WOFF, style the glyphs, and export AngelCode BMFont text, XML, binary or JSON descriptors with PNG atlas pages. SDF and MSDF rendering are built in,…

Blender 4+ add-on that imports, exports, and authors GTA V format drawables, collisions, archetypes, and (partial) maps. This entry is the plugin's GPL-3 software license. It is not a catalog of GTA V assets and not a…

Browser tilemap editor. Drop in any tileset, paint layers with auto-tiling and collision, and export straight to a Unity package, a Godot scene, Defold assets or several other engines, or as JSON, TMX or PNG. The free…

Fixes pixel art that is not on a grid. It detects the pixel size, snaps every pixel to a consistent grid and quantises colours to a fixed or supplied palette, keeping details such as dithering. It is built for AI-gene…

A browser-based sprite editor for the Commodore 64 by Ingo Hinterding (awsm). It enforces the C64's 24x21 sprite size and single-colour or multicolour modes, previews animation, and saves to SpritePad formats, assembl…

Save game and level persistence plugin for Unreal Engine 5. Actors opt in through a marker interface and properties through the engine's existing SaveGame flag, and SPUD then saves and restores them, including referen…

Google Chrome Labs image compression web app. Drop in an image, pick a codec and settings, compare against the original, and export. The repository ships MozJPEG, OxiPNG, WebP, AVIF, JPEG XL, QOI and WebP2 codecs plus…

Dialogue plugin for Unreal Engine 5 where conversations are written as plain-text scripts rather than drawn as graphs. Scripts cover speaker lines, player choices, goto and gosub, conditional branches, random lines, p…

Modular synthesizer and pattern-based tracker from Alexander Zolotov (WarmPlace). You wire synth and effect modules into a graph and sequence them in tracker patterns. It is small and fast, runs on very old hardware, …

Data-driven quest system for Unreal Engine. Quest structures, objectives and tasks are defined in data tables, edited in the editor or written as JSON with a provided schema for autocomplete and validation, and a smal…

Progressive Web App (repository tomayac/SVGcode, copyright Google LLC) that converts raster images such as JPG, PNG, GIF, WebP and AVIF to colour or monochrome SVG, using Potrace-based tracing plus SVGO optimisation. …

Vector 2D animation program built around tweening: you set keyframes and Synfig interpolates shapes, transforms and bone rigs between them, instead of drawing every frame. Useful for cut-out style character animation …

Community fork of Audacity, maintained on Codeberg, for trimming and cleaning the sample-based SFX this catalog points at. Covers the unglamorous work a game project actually needs: batch resampling a downloaded pack …

Clipmap terrain system for Godot 4, built as a C++ GDExtension. This is the piece the catalog was missing between raw elevation data and a playable world: it imports 16-bit heightmaps, paints up to 32 texture layers w…

Mature tilemap editor (isometric/hex/ortho). The editor (src/tiled) is GPL-2.0. Official libtiled is BSD-2-Clause, not MIT. You can ship commercial games that load Tiled maps through a BSD/MIT loader. Do not staticall…

Node-based procedural tile generator for pixel-art games. You build a heightmap from noise generators and filters, and the program shades it into a tile. Nodes and presets are Lua scripts, so you can write your own. I…

A small Python 3 command-line script by Morgan Holly that cuts a tilesheet into separate PNG files, either numbered by grid position or named from a text file you supply. A .tsn template file can declare the image pat…

Brush-based 3D level editor for Quake-engine map formats, on Windows, macOS and Linux. With func-godot the .map files it writes import straight into Godot, which makes it a blockout and level tool for Godot projects a…

Apache 2.0 Windows overlay for real-time colorblind / CVD simulation during playtests. Complements Color Oracle-style workflows. Tool license; it does not license your game's art.

C++20 coroutine support for Unreal Engine, built around gameplay code. Changing a function's return type to one of the plugin's coroutine types lets it co_await delays, ticks, async asset loads, delegates, timelines a…

Unreal Engine plugin that integrates Dear ImGui, the immediate-mode GUI library, for in-game debug windows, tweak panels and developer tools drawn from a few lines of C++. This entry links the IDI-Systems fork, which …

Godot add-on that breaks a mesh into Voronoi fragments inside the editor, then builds rigid bodies and collision shapes for the pieces. This is the catalog's answer to "where do my pre-broken debris meshes come from" …

Raster-to-vector converter from visioncortex, written in Rust. Unlike Potrace it handles full-colour images, and it stacks shapes instead of cutting holes, so the SVG output is compact. It ships as desktop apps for Wi…

Audiokinetic middleware — the Indie plan is free for game projects with a production budget under $250K, royalty free, with unlimited sounds. A licence is per title and per platform (Indie platforms are free). DLC wit…

Windows baker (v3.19.3c) for normal maps, AO, and related texture maps from high/low meshes. DirectX 10+, 4 GB RAM. The homepage only calls it a "free app", but the licence shipped inside the official installer (docs/…