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An open source re-implementation of RollerCoaster Tycoon 2 🎢

Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe

A work-in-progress, open-source, multi-player city simulation game.

Transportation planning and traffic simulation software for creating cities friendlier to walking, biking, and public transit

Tower defense game that teaches cloud architecture. Build infrastructure, survive traffic, learn scaling.

Written 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.

Python framework for creating, editing, and running Noisy Intermediate-Scale Quantum (NISQ) circuits.

Webots Robot Simulator

Mesa is an open-source Python library for agent-based modeling, ideal for simulating complex systems and exploring emergent behaviors.

Python Toolkit for Causal and Probabilistic Reasoning

Agent 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.

ECS-driven 2D and 3D physics engine for the Bevy game engine.

MacOS application to spoof / fake / mock your iOS / iPadOS or iPhoneSimulator device location. WatchOS and TvOS are partially supported.

Model-rocketry aerodynamics and trajectory simulation software

Open-source, end-to-end platform for evaluating, observing, and improving LLM and AI agent applications. Tracing · Evals · Simulations · Datasets · Gateway · Guardrails. Self-hostable. Apache 2.0.

A game of lonely space adventure

An open source re-implementation of Chris Sawyer's Locomotion

3D City Builder without a grid

Unknown Horizons official code repository

Open source remake and Fan Expansion of Dungeon Keeper.

Unknown Horizons Godot Engine Port

A port of Micropolis to JS/HTML5

NOTE: development in stuntrally3 repo. 3D racing game based on VDrift and OGRE with own Track Editor. The main repository with Stunt Rally 2.x sources and data.

Mathematical Finance Library: Algorithms and methodologies related to mathematical finance.

A Python native dynamical system simulation framework in the block diagram paradigm.

In-browser falling-sand simulation game with over 500 elements and thousands of reactions.

Multibody dynamics tool kit.

A sandbox billiards game that emphasizes realistic physics

A digital twin of the city of Colombo, Sri Lanka, implemented in Cities: Skylines, based on real data. Nearly 1:1 in terms of geography and population.