Modeling GitHub Repositories (2026) · Open Source Tools

Linked Open Data Modeling Language

High-performance C++ library for multiphysics and multibody dynamics simulations

The official repository for the gem5 computer-system architecture simulator.

Parametric CAD modeling with Lua

🖥️ Second Life's official client

Umple: Model-Oriented Programming - embed models in code and vice versa and generate complete systems. Save yourself lots of coding. Do it collaboratively online in UmpleOnline, in an IDE or on the command line.

DevTools and runtime environment for the Elm programming language

Monorepo for 3D algorithms of Bitbybit platform, which helps programming geometry on the browser. Use with ThreeJS, BabylonJS or PlayCanvas. Build your own core integration or execute algorithms in NodeJS.

Open source framework for representing and manipulating geometric models

View and edit BPMN diagrams in VSCode. Powered by bpmn.io tools.

PlanDev - A software framework for modeling spacecraft.

Legend Engine module

Legend Studio

UML Modeling Editor

DEVSimPy – Visualize, Model, and Simulate Discrete Event Systems with Python.

BodySlide and Outfit Studio, a tool to convert, create, and customize outfits and bodies for Bethesda games.