Godot is a powerful cross-platform game engine
A certain block game
The game engine for everyone
An open-source sandbox tower defense game
RetroArch is a frontend for emulators, game engines and media players.
Desktop/Android/HTML5/iOS Java game development framework
Cocos simplifies game creation and distribution with Cocos Creator
Xash3D FWGS engine
Open source HTML5 game framework that offers WebGL and Canvas
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
A simple and easy-to-use library to enjoy videogames programming
A dead simple 2D game engine for Go
One framework for creating powerful cross-platform games
Multi-platform 2D and 3D game engine
New Godot bindings for Swift
The source code to VVVVVV
Cross-platform game engine in Rust
Do virtual gear shifting (and more) in any rider app
Open source library for creative expression on the web, desktop, etc.
Action-adventure game originally released in 2013
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
GemRB is a portable open-source implementation of the Infinity Engine
Domination is a game that is a bit like the board game Risk
Use the Delta Executor APK with Roblox on a Windows PC.