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Unreal Agent is an async-first agent harness from Unreal Labs. Its library and command-line executables coordinate persisted agent sessions, LLM turns, tool calls, and asynchronous operations. Inputs carry caller-supplied globally unique IDs for deduplication; sessions store append-only history that can be recovered or forked; and tool translators validate model-produced calls and convert them into serializable operations whose execution state is tracked separately. The harness includes a session inbox, coordinator, session store, context builder, LLM adapter, tool registry, tool translators, and an operation manager. Session and operation data are versioned and serializable, allowing operations to be dispatched to alternative or remote runtimes; unsupported session versions produce an explicit resume error. The repository contains the harness library, executables, and benchmark runners.

BRUTAL is an open-source C# framework for making games or building a separate game engine. It provides a custom interop layer for direct access to native APIs, along with low-level libraries for unmanaged memory, collections, strings, mathematics, concurrency, logging, localization, and bindings for graphics, windowing, audio, networking, physics, and other native components. BRUTAL deliberately has no editor, scene graph, renderer, or general-purpose engine architecture. Developers assemble their own stack from separate NuGet packages, such as packages for Vulkan, GLFW, Dear ImGui, FMOD, RakNet, Jolt, and Box2D; the framework uses unmanaged memory, unsafe code, and allocation-avoiding components where appropriate. The repository contains the source for its published packages. BRUTAL is developed by Ahwoo Limited and is free to use, modify, and distribute, including in commercial games, under a licence based on MIT with attribution requirements.

Rabbet is a from-scratch C++ 3D game engine with a sparse-set entity-component system, versioned entity handles, dense component pools, and a system-and-resource runtime. Its OpenGL 4.1 renderer provides a forward path with metallic-roughness PBR, a Phong fallback, lighting and shadow maps, emissive surfaces, optional image-based lighting, post-processing, CPU particles, and heightmap or noise terrain. The Forge editor provides a dockable ImGui workspace around a render-to-texture viewport, asset thumbnails, hierarchy reparenting, click-to-pick, snapping gizmos, and Play/Pause/Step/Stop controls that snapshot and restore scenes. Assets use stable UUIDs and .import sidecars; models, textures, audio, materials, shaders, prefabs, and scenes are supported, with scenes stored as readable JSON. Lua behaviors run through sol2 with live hot-reload and inspector-editable fields, while physics uses Jolt rigidbodies and audio uses miniaudio. The repository includes the engine, editor, examples, and tests, including the Orb Hunt demo game. It uses CMake 3.24 or later and a C++20 compiler, supports macOS and Linux, fetches pinned dependencies during configuration, and is licensed under Apache License 2.0.

Universal Modder is an open-source toolkit by rehan-remade for AI coding agents that create offline, single-player mods for PC games. Its skills and tools identify a game's engine and existing modding route, inspect code and files, back up saves, build a working mod slice, generate art, 3D assets and audio through the fal MCP server, test the result in the running game, package it, and record findings for later agents. The repository supports Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and other agents that read AGENTS.md, and includes the Python `um` CLI for game scanning, asset generation and processing, Windows automation, save management, video capture, publishing checks and a shared knowledge base of game-specific field notes. Its rules restrict use to games owned by the user and offline or single-player work; they prohibit online cheats, anti-cheat or DRM bypasses, and distributing game files or decompiled code. The repository is MIT licensed and requires Python 3.10+ and ffmpeg; Blender is used for 3D-to-sprite rendering.

Genex Desktop is a desktop application for developing games with AI on macOS and Linux. It provides a multi-agent workspace in which a main agent, worker agents, and reviewers can use Claude Code, ChatGPT, or local models; projects can be exported or published to the web. The app supports local 3D asset creation through a Blender plugin and can connect to services such as Meshy, Tripo, and ElevenLabs through its tools router. Its plugin system lets developers add asset generators, engine bridges, and game services, with plugins installable from GitHub or the Genex Marketplace. The project is distributed under the MIT license; Windows, Unity, Unreal, and native C++ support are listed as upcoming.