GitHub stars · StarDay

1PavelDoGreat / WebGL-Fluid-SimulationPlay with fluids in your browser (works even on mobile)JavaScriptMIT · Permissive16,801

2OpenRCT2 / OpenRCT2An open source re-implementation of RollerCoaster Tycoon 2 🎢C++GPL-3.0 · Share derivative source16,545

3bulletphysics / bullet3Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.C++License not declared14,843

4jrouwe / JoltPhysicsA multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.C++MIT · Permissive12,214

5taojy123 / KeymouseGoMouse and keyboard recording and automation operations similar to Key Wizard simulate clicks and typing | automate mouse clicks and keyboard inputPythonGPL-2.0 · Share derivative source10,650

6ange-yaghi / engine-simCombustion engine simulator that generates realistic audio.C++MIT · Permissive9,636

7OpenTTD / OpenTTDOpenTTD is an open source simulation game based upon Transport Tycoon DeluxeC++License not declared8,468

8a-b-street / abstreetTransportation planning and traffic simulation software for creating cities friendlier to walking, biking, and public transitRustApache-2.0 · Permissive8,190

9citybound / cityboundA work-in-progress, open-source, multi-player city simulation game.RustAGPL-3.0 · Share derivative source8,178

10pshenok / server-survivalTower defense game that teaches cloud architecture. Build infrastructure, survive traffic, learn scaling.JavaScriptMIT · Permissive6,478

11PetoiCamp / OpenCat-Quadruped-RobotAn open source quadruped robot pet framework for developing Boston Dynamics-style four-legged robots that are perfect for STEM, coding & robotics education, IoT robotics applications, AI-enhanced robotics application services, research, and DIY robotics kit development.C++MIT · Permissive5,544

12The-Powder-Toy / The-Powder-ToyWritten in C++ and using SDL, The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, it simulates air pressure and velocity as well as heat.C++GPL-3.0 · Share derivative source5,395

13ProjectPhysX / FluidX3DAuthor description: The fastest and most memory efficient lattice Boltzmann CFD software, running on all GPUs and CPUs via OpenCL. Free for non-commercial use.C++License not declared5,355

14cyberbotics / webotsWebots Robot SimulatorC++Apache-2.0 · Permissive4,752

15session-replay-tools / tcpcopyAn online request replication and TCP stream replay tool, ideal for real testing, performance testing, stability testing, stress testing, load testing, smoke testing, and more.CLicense not declared4,686

16st-tech / ppf-contact-solverA contact solver for physics-based simulations involving 👚 shells, 🪵 solids, 🪢 rods, 🧱 rigid bodies and ⏳ sand.PythonApache-2.0 · Permissive4,595

17eclipse-sumo / sumoEclipse SUMO is an open source, highly portable, microscopic and continuous traffic simulation package designed to handle large networks. It allows for intermodal simulation including pedestrians and comes with a large set of tools for scenario creation.PythonEPL-2.0 · Share derivative source4,261

18mesa / mesaMesa is an open-source Python library for agent-based modeling, ideal for simulating complex systems and exploring emergent behaviors.PythonApache-2.0 · Permissive3,945

19NVIDIA / skillsAgent Skills for NVIDIA products — install into Claude Code, Codex, and other coding agents to run Physical AI, robotics, simulation, CUDA, and RAG workflows end to end.PythonApache-2.0 · Permissive3,874

20Revolutionary-Games / ThriveThe main repository for the development of the evolution game Thrive.C#License not declared3,830