Box3D

Jolt Physics is an open-source, multicore-friendly C++ rigid-body physics and collision-detection library for games and VR applications. It simulates rigid bodies with continuous collision detection across shapes such as spheres, boxes, capsules, convex hulls, meshes, and terrain; supports constraints including fixed, hinge, slider, gear, pulley, spline, and six-degrees-of-freedom joints; and provides ray casting, shape queries, broad-phase detection, sensors, vehicles, ragdolls, soft bodies, and buoyancy. Its design supports concurrent physics-data access, background loading and unloading of bodies, collision queries running alongside simulation, and deterministic simulation by replicating inputs. The project also provides bindings for several languages.

Three.js is an open-source JavaScript 3D library developed in the mrdoob/three.js project for assembling and rendering procedural scenes in browser applications, including Fable 51 Worlds, Human Atlas, browser FPS worlds, CAD workspaces, and physics games. It creates scenes containing cameras, geometry, materials, meshes, and animations, with WebGL and WebGPU renderers and SVG and CSS3D renderers available as addons. Its official site and repository provide documentation, examples, tools, an editor, community resources, and a JavaScript module distribution.

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.

ammo.js is a JavaScript port of the Bullet physics engine for browser-based 3D applications, produced by translating Bullet's C++ source with Emscripten. It provides autogenerated JavaScript bindings for Bullet classes and functions, accessed through the `Ammo.*` namespace, and includes examples and demos for rigid bodies, soft bodies, vehicles, heightmaps, and WebGL. The project includes a prebuilt distribution and can also be built with Emscripten and CMake; it is licensed under the zlib license.

A browser-based first-person shooter built with Three.js r180 and WebGL2. It uses procedurally generated textures, meshes, animations, and Web Audio synthesis rather than external art or sound files; its systems include a market-street world with enterable interiors, custom physics and character movement, procedural weapons and ballistics, GPU visual effects, navmesh-based enemy AI with perception and cover behavior, and a DOM/CSS HUD. The repository also provides a development and testing harness: headless-Chromium screenshot capture, isolated reproducible shotsets with pixel-diff gating, scripted playtesting, and a gameplay profiler that reports frame-time distributions and attributes hitches to per-frame WebGL program compilation. The project is run with npm and has Three.js as its only runtime dependency.