Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
A fun realistic multiplayer free-and-open-source first-person-shooter!
Cross-Platform Level Editor for Doom3 and The Dark Mod
Modern, lightweight and efficient 2D level editor
Turn based tactical RPG with several campaigns, written in Rust
Bloat-free Immediate Mode Graphical User interface for JVM
A development environment focused on modding
Open-source full-stack web development framework built on top of React
MIT Licensed Open Source version of Torque3D from GarageGames
2D top-down 1v1 MOBA with autonomous units
An ASI plugin for Grand Theft Auto V
An Simple GameEngine.
A Rust framework for building Minecraft servers
Open source reimplementation of GTA San Andreas game engine in Unity
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
A greedy game engine for greedy programmers
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Vivid is a modern C++ 3D engine using OpenGL4+
3D C++ Game Engine - yet another open source game engine
2D Game Engine
Modern 3D engine and IDE written using C# and C++.
A RPG maker engine using Pygame
2D Game Engine with Lua Scripting made on top of SFML