Godot Engine – Multi-platform 2D and 3D game engine

GPT4All: Run Local LLMs on Any Device. Open-source and available for commercial use.

🎮 A step-by-step guide to implementing SSAO, depth of field, lighting, normal mapping, and more for your 3D game.

Valdi is a cross-platform UI framework that delivers native performance without sacrificing developer velocity.

Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

Elements C++ GUI library

An open source version of a game engine developed by Croteam for the classic Serious Sam games.

SuperTux source code

OpenRW "Open ReWrite" is an un-official open source recreation of the classic Grand Theft Auto III game executable

Draw 3D debug graphics and 2D overlays with this add-on.

ESM Nodejs bindings to OpenCV 3/4

Open source game engine version developed by Croteam for Serious Sam Classic (Windows, Linux, FreeBSD, OpenBSD, NetBSD, macOS, Raspberry Pi OS). Based on https://github.com/Croteam-official/Serious…

Open source game engine version developed by Croteam for Serious Sam Classic with Vulkan support (Windows, Linux, FreeBSD, OpenBSD, macOS, Raspberry Pi OS). Based on https://github.com/sultim-t/Ser…

SuperTux source code