Open-source simulation software

698 open-source libraries, tools and applications tagged simulation, ranked by how closely simulation is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.

698 products, primary matches first, then adoption-weighted; health v2 shown.

Product	Health v2	Stars	Maturity
Godot Engine Godot Engine is a free, open‑source, cross‑platform 2D and 3D game engine written in C++. It provides a full editor, scripting languages, a…	97	118407	stable
BettaFish MiroFish is a Python-based swarm intelligence prediction engine that builds high-fidelity parallel digital worlds populated by thousands of…	67	76494	active
Bevy Bevy is an open‑source, data‑driven game engine and application framework written in Rust. It provides a fast, parallel ECS, 2D/3D renderin…	91	48687	active
FreeCAD FreeCAD is a free and open-source, cross-platform 3D parametric CAD modeler for designing real-life objects of any size, built on the OpenC…	95	34484	stable
Genesis World Genesis World is a Python‑based simulation platform that combines a unified multi‑physics engine, a photorealistic renderer, and a cross‑pl…	95	30058	active
Genesis World Genesis World is a Python simulation platform for physical AI and robotics that combines a unified multi-physics engine, a photorealistic r…	95	30058	active
Taichi Taichi Lang is an open-source domain-specific language embedded in Python for high-performance parallel numerical computation, using a JIT …	60	28390	active
Babylon.js Babylon.js is an open-source 3D game and rendering engine for the web, written in TypeScript and built on WebGL, WebGPU, and Web Audio. It …	94	26140	stable
libgdx/libgdx libGDX is a cross‑platform Java game development framework that abstracts OpenGL (ES) for Windows, Linux, macOS, Android, iOS, and HTML5. I…	84	25454	active
ML-Agents The Unity Machine Learning Agents Toolkit (ML-Agents) lets Unity games and simulations serve as environments for training intelligent agent…	66	19717	active
louis-e/arnis Arnis is a free, open-source desktop application that generates detailed Minecraft Java and Bedrock Edition worlds from real-world geograph…	99	18332	active
official-stockfish/Stockfish Stockfish is a free, open-source UCI chess engine that analyzes positions and computes optimal moves using alpha-beta search with NNUE neur…	85	16704	active
PavelDoGreat/WebGL-Fluid-Simulation A browser-based interactive fluid simulation built with WebGL that solves Navier-Stokes equations on the GPU. It runs as a web demo and wor…	32	16652	stable
OpenRCT2 OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2, a construction and management simulation game about running amuseme…	96	16250	active
PCSX2/pcsx2 PCSX2 is a free, open-source PlayStation 2 emulator that emulates PS2 hardware using MIPS CPU interpreters, recompilers, and a virtual mach…	98	15820	active
MuJoCo MuJoCo (Multi-Joint dynamics with Contact) is a general-purpose physics engine for fast and accurate simulation of articulated structures i…	100	15719	active
bulletphysics/bullet3 Bullet Physics SDK is a C++ library providing real-time collision detection and rigid/soft body multi-physics simulation, with Python bindi…	41	14766	stable
CARLA Simulator CARLA is an open-source simulator for autonomous driving research built on Unreal Engine, providing open digital assets like urban layouts,…	67	14465	active
CleverRaven/Cataclysm-DDA Cataclysm: Dark Days Ahead is a turn-based survival roguelike game set in a procedurally generated post-apocalyptic world, written in C++. …	87	13378	active
Open MCT Open MCT is NASA's open-source, web-based mission control framework for visualizing telemetry data on desktop and mobile devices. It provid…	85	13153	active
skypjack/entt EnTT is a header-only, dependency-free C++17/20 entity component system (ECS) library for game programming and other data-oriented applicat…	83	13150	stable
Jolt Physics Jolt Physics is a multicore-friendly rigid body physics and collision detection library written in C++. It is designed for games and VR app…	86	11762	stable
stenzek/duckstation DuckStation is a fast, accurate PlayStation 1 (PSX) emulator for x86-64, AArch32/AArch64, and RISC-V platforms. It ships a Qt frontend plus…	99	10823	active
a16z-infra/ai-town AI Town is a deployable starter kit for building a virtual town where AI characters live, chat, and socialize, inspired by the Generative A…	70	10589	active
RetroPie A shell-based setup script that installs and configures RetroArch, emulator cores, and the EmulationStation front end on Raspberry Pi, ODro…	66	10420	active
erincatto/box2d Box2D is a widely used open-source 2D rigid body physics engine for games, written in portable C17 with a data-oriented design, multithread…	74	10413	stable
Stellarium/stellarium Stellarium is a free open-source planetarium application that renders a realistic 3D sky in real time using OpenGL, showing what is visible…	90	10045	stable
Open 3D Engine (O3DE) Open 3D Engine (O3DE) is an Apache 2.0-licensed, multi-platform 3D game engine for building AAA games, cinema-quality 3D worlds, and high-f…	88	9739	active
Xenia Xenia is an experimental open-source emulator for the Xbox 360, developed through reverse engineering of legally purchased hardware and gam…	59	9694	active
AzerothCore AzerothCore is an open-source, modular MMO server emulator for World of Warcraft (WotLK 3.3.5a), built on MaNGOS, TrinityCore, and SunwellC…	68	9065	active
sebastianstarke/AI4Animation AI4Animation is a deep learning framework for data-driven character animation and control, built around Unity with a Python remake (AI4Anim…	63	8873	active
SanderMertens/flecs Flecs is a fast, lightweight Entity Component System (ECS) framework for C99 and C++17 that enables building games and simulations with mil…	90	8755	stable
isaac-sim/IsaacLab Isaac Lab is a GPU-accelerated open-source framework for robot learning built on NVIDIA Isaac Sim, unifying workflows like reinforcement le…	96	8397	active
OpenTTD/OpenTTD OpenTTD is an open-source transport simulation game based on Transport Tycoon Deluxe, written in C++. It extends the original game with lar…	88	8323	stable
recastnavigation/recastnavigation Recast Navigation is an industry-standard C++ toolset for generating navigation meshes from level geometry and performing runtime pathfindi…	50	7935	stable
stride3d/stride Stride (formerly Xenko) is a free, open-source, cross-platform C# game engine for building 2D and 3D games, VR experiences, and interactive…	100	7885	active
logisim-evolution/logisim-evolution Logisim-evolution is a free, open-source, cross-platform Java application for designing and simulating digital logic circuits. It offers an…	87	7803	active
Veloren Veloren is an open-source, multiplayer voxel action-adventure RPG inspired by Cube World, Dwarf Fortress, and Breath of the Wild. It featur…	66	7592	active
mgba-emu/mgba mGBA is a fast and highly accurate emulator for Game Boy Advance games, with additional support for Game Boy and Game Boy Color titles. It …	75	7511	active
princeton-vl/infinigen Infinigen is a procedural generator of infinite photorealistic 3D worlds and scenes, built on Blender by the Princeton Vision & Learning La…	88	7277	active
win12-online/win12 Win12 Online is a web-based recreation of a hypothetical Windows 12 desktop experience, built entirely with HTML, CSS, and JavaScript. It s…	76	7267	active
Wicked Engine Wicked Engine is an open-source C++ 3D game engine with modern graphics features like ray tracing, global illumination, and physically base…	96	7258	active
NVIDIA/warp NVIDIA Warp is a Python framework that JIT-compiles regular Python functions into efficient CPU or CUDA GPU kernels. It provides differenti…	99	7215	active
erincatto/box3d Box3D is a 3D rigid body physics engine for games, written in portable C17 with a data-oriented design. It provides collision detection, jo…	65	6587	active
Digital Digital is a digital logic designer and circuit simulator built in Java, aimed primarily at education. It supports interactive signal visua…	67	6089	active
CGAL/cgal CGAL (Computational Geometry Algorithms Library) is a mature C++ library providing efficient and reliable algorithms for computational geom…	97	6071	stable
Pokémon Showdown Pokémon Showdown is a Pokémon battle simulator that runs as a website, a self-hostable game server, and a JavaScript library for simulating…	84	5976	active
Galacean Engine Galacean Engine is a high-performance, real-time interactive 2D/3D engine written in TypeScript, built on WebGL/WebGL2 with support for ani…	84	5901	active
Rapier Rapier is a set of high-performance 2D and 3D physics engines written in Rust, providing rigid-body dynamics, joint constraints, collision …	77	5848	stable
Newton Newton is an open-source, GPU-accelerated physics simulation engine built on NVIDIA Warp, targeting roboticists and simulation researchers.…	87	5813	active
chrxh/alien ALIEN is a CUDA-powered artificial life simulation application that simulates digital organisms as particle networks with genetics and neur…	74	5539	active
QuipNetwork/xq-py A Python implementation of the Quip Network's quantum virtual machine, allowing users to simulate quantum programs locally. It serves as a …	50	5510	active
flybywiresim/aircraft FlyByWire Simulations' open-source projects recreating the Airbus A320neo (A32NX) and A380-800 (A380X) as free, high-fidelity aircraft add-…	97	5414	active
The-Powder-Toy/The-Powder-Toy The Powder Toy is a free, open-source falling-sand physics sandbox game written in C++ with SDL, simulating air pressure, velocity, heat, a…	91	5336	active
ProjectPhysX/FluidX3D FluidX3D is a high-performance lattice Boltzmann method computational fluid dynamics (CFD) application written in C++/OpenCL. It runs on al…	90	5290	active
piqnt/planck.js Planck.js is a JavaScript/TypeScript rewrite of the Box2D 2D rigid-body physics engine, designed for cross-platform HTML5 game development.…	75	5284	active
Panda3D Panda3D is a mature, open-source cross-platform game engine and 3D rendering framework for Python and C++, originally developed by Disney a…	67	5227	stable
Baekalfen/PyBoy PyBoy is a Game Boy and Game Boy Color emulator written in Python, usable both as a standalone terminal application and as an embeddable Py…	94	5217	active
opentrack/opentrack opentrack is a head tracking application that captures a user's head movements via webcams, IR trackers, or hardware devices and relays the…	72	5145	active
libigl libigl is a simple C++ geometry processing library offering a wide range of algorithms for triangle and tetrahedral meshes, including defor…	85	5105	stable
quantumlib/Cirq Cirq is a Python framework from Google Quantum AI for writing, manipulating, optimizing, and simulating quantum circuits, with a focus on N…	86	5086	stable
melonDS melonDS is a fast and accurate Nintendo DS and DSi emulator written in C++, featuring a nearly complete core with JIT recompilation, OpenGL…	67	5043	active
joonspk-research/generative_agents The official code release for the Stanford 'Generative Agents' research paper, implementing computational agents powered by LLMs that simul…	29	22237	maintenance
86Box 86Box is a low-level x86 emulator that accurately emulates IBM PC-compatible machines from 1981 through PCI-era systems, including CPUs, ch…	88	4940	active
Nav2 Nav2 is the industry-standard navigation framework for ROS 2, providing perception, path planning, control, localization, and behavior-tree…	100	4821	stable
dimforge/nalgebra nalgebra is a general-purpose linear algebra library for Rust providing statically-sized and dynamically-sized vectors and matrices, along …	76	4801	stable
CloudCompare CloudCompare is a 3D point cloud and triangular mesh processing application, originally built to compare point clouds from laser scanners a…	86	4788	active
NVIDIA-Omniverse/PhysX NVIDIA PhysX SDK, a real-time physics simulation engine for games, robotics, and simulation, plus Omniverse PhysX extensions and the ovphys…	96	4775	stable
zalo/MathUtilities A collection of math and physics utility implementations in C# for Unity, covering techniques like Kabsch alignment, mesh deformation, sign…	32	4755	active
SebLague/Digital-Logic-Sim A minimalistic digital logic simulator where users start with a single NAND gate and build increasingly complex custom chips, up to full CP…	39	4725	active
Webots Webots is an open-source, multi-platform desktop application for modeling, programming, and simulating robots, vehicles, and mechanical sys…	67	4698	stable
st-tech/ppf-contact-solver A GPU-accelerated contact solver for physics-based simulations of shells (cloth), solids, rods, rigid bodies, and sand, originally develope…	87	4513	active
DeepXDE DeepXDE is a Python library for scientific machine learning and physics-informed learning, built on top of PyTorch, TensorFlow, JAX, and Pa…	75	4477	stable
MichaelGrupp/evo evo is a Python package with CLI executables and a small library for evaluating, comparing, and plotting trajectory output from odometry an…	74	4318	stable
Beyond All Reason Beyond All Reason is a free, open-source real-time strategy (RTS) game built on the Recoil RTS engine, featuring large-scale battles with f…	77	4315	active
TokisanGames/Terrain3D Terrain3D is a high-performance, editable terrain system for Godot 4, written in C++ as a GDExtension addon. It supports sculpting, texture…	82	4310	active
isaac-sim/IsaacSim NVIDIA Isaac Sim is an open-source robotics simulation application built on NVIDIA Omniverse for developing, simulating, and testing AI-dri…	83	4283	active
BehaviorTree.CPP BehaviorTree.CPP is a C++17 framework for building Behavior Trees, designed to be flexible, reactive, and fast, with asynchronous actions a…	82	4237	stable
RobotLocomotion/drake Drake is a C++ toolbox (with Python bindings) for model-based design and verification of robotics systems, developed by the Robot Locomotio…	100	4230	stable
eclipse-sumo/sumo Eclipse SUMO (Simulation of Urban MObility) is an open source, microscopic and continuous traffic simulation suite for large road networks,…	77	4215	stable
xemu-project/xemu xemu is a free, open-source low-level emulator of the original Microsoft Xbox console, built on QEMU, that runs Xbox games and homebrew on …	95	4200	active
verilator/verilator Verilator is an open-source Verilog/SystemVerilog simulator and lint system that compiles RTL designs into fast, multithreaded C++ or Syste…	77	4021	stable
NeuralOperator A PyTorch library for learning neural operators, which map between function spaces rather than finite-dimensional vectors. It provides the …	81	3955	active
Voxel Tools for Godot A C++ module and GDExtension for Godot Engine that adds voxel terrain support, including blocky and smooth volumetric terrains with meshing…	96	3921	active
Grasscutters/Grasscutter Grasscutter is a Java-based server software reimplementation for a certain anime game, allowing users to run their own private game server.…	51	16829	maintenance
wave-harmonic/crest Crest Water 4 is an advanced, class-leading water and ocean rendering system for Unity, implemented in C# with GPU displacement and samplin…	68	3909	active
Space Station 14 Space Station 14 is an open-source, round-based multiplayer roleplaying game about paranoia and chaos aboard a space station, remaking the …	84	3875	active
misprit7/computerraria Computerraria is a fully compliant RISC-V (rv32i) computer built entirely inside the wiring system of the game Terraria, paired with a Rust…	70	3861	active
Mesa Mesa is an open-source Python framework for agent-based modeling (ABM), providing modular components like spatial grids, agent schedulers, …	87	3854	active
stack-of-tasks/pinocchio Pinocchio is a fast C++ library (with Python bindings) implementing state-of-the-art rigid body dynamics algorithms for poly-articulated sy…	90	3788	active
Thrive Thrive is a free, open-source evolution simulation game developed by Revolutionary Games in C# on the Godot engine, where players guide a s…	92	3721	active
VRTK VRTK v4 is an example Unity project (Farm Yard scene) demonstrating how to use the Tilia packages to rapidly build spatial computing / virt…	23	3721	active
steveicarus/iverilog Icarus Verilog is an open-source Verilog HDL compilation system that compiles IEEE 1364 Verilog and a growing subset of SystemVerilog (IEEE…	77	3684	active
mikedh/trimesh Trimesh is a pure Python library for loading, manipulating, and analyzing triangular meshes with an emphasis on watertight surfaces. It pro…	95	3681	stable
NVlabs/GR00T-WholeBodyControl NVIDIA's unified platform for developing, training, and deploying whole-body controllers for humanoid robots, including the decoupled WBC m…	60	3654	active
TASEmulators/desmume DeSmuME is an open-source Nintendo DS emulator written in C++, distributed under the GPL-2.0 license. It offers Windows, macOS (Cocoa), and…	65	3649	active
unitreerobotics/unitree_rl_gym A reinforcement learning gym environment for training locomotion policies on Unitree robots (Go2, H1, H1_2, G1) using Isaac Gym and Mujoco.…	39	3583	active
petercorke/robotics-toolbox-python A Python library providing tools for robot manipulator kinematics, dynamics, Jacobians, and trajectory generation, built on NumPy and SciPy…	99	3545	active
Auburn/FastNoiseLite FastNoise Lite is a highly portable noise generation library offering 2D/3D Perlin, OpenSimplex2, Cellular (Voronoi), Value, and Cubic nois…	59	3527	stable
gkjohnson/three-mesh-bvh A Bounding Volume Hierarchy (BVH) acceleration library for three.js that speeds up raycasting and enables spatial queries against meshes. I…	99	3513	active