Open-source, cross-platform 2D and 3D game engine built in C++

Lightweight Game Engine/Framework in C++17 with WYSIWYG Editor. Experimental C# bindings.

Nazara Engine is a cross-platform framework aimed at (but not limited to) real-time applications requiring audio, 2D and 3D real-time rendering, network and more.

Cross-Platform C++ 2D/3D game engine

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

A modern, C++-native, header-only, test framework for unit-tests, TDD and BDD - using C++11, C++14, C++17 and later (or C++03 on the Catch1.x branch)

stb single-file public domain libraries for C/C++

Simple and Fast Multimedia Library

Skyrim and Fallout 4 mod to play online!

Gaming meets modern C++ - a fast and reliable entity-component system (ECS) and much more

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

The Istio proxy components.

Proxy: Easy Polymorphism in C++

Network Next is a network accelerator for multiplayer games

Bringing the 3D geospatial ecosystem to Unreal Engine

3D Terrain Renderer (C++17)

Bim! is a last-man-standing arcade online game for Android

Scion2D - 2D Game Engine

ccache – a fast compiler cache

Simulationcraft engine/GUI

Donner SVG, a modern C++20 SVG rendering library supporting the latest SVG2 and CSS3 standards

A reimplementation of Remedy Entertainments Alan Wake Engine, in later iterations known as the Northlight Engine

Talk to your Mac, query your docs, no cloud required. On-device voice AI + RAG

Mirror of Ardour Source Code

A tower defense game developed in C++ with SDL3, entt, imgui, glm, nlohmann-json and Tiled.

Stable Diffusion and Flux in pure C/C++

Official inference framework for 1-bit LLMs

MNN is a lightweight deep neural network inference engine.

Simple, light-weight and easy-to-use asynchronous components

JSON for Modern C++