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Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
The ioquake3 community effort to continue supporting/developing id's Quake III Arena
A high speed C++17 Vulkan game engine
A cross-platform 2D game engine
Cross-platform (desktop, mobile, console, web) 3D and 2D game engine. Powerful visual editor. Support for glTF, X3D, IFC and more. Fast clean code using modern Pascal. Free and open-source.
2D Game Engine with Lua Scripting made on top of SFML !
:video_game: Pokemon MMO engine with realtime editor
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
Rapidly cook up games for HTML5, Flash, Android, and iOS.
Create Flash, HTML5, iOS, Android, and desktop games with no code with Stencyl. This is the source to Stencyl's Haxe-based engine.
An open source, cross-platform game engine designed for indie developers.
Cross Platform D-Lang Game Engine with scripting support
Tetragon is an Open Source cross-platform game engine used to develop games and applications for the web, desktop and mobile devices. It is written purely in ActionScript 3 and comfortably allows to write source code once and deploy builds to several different target platforms. Unlike most other Flash-based game engines and frameworks that allow you to develop a specific type of game or that provide a subset API to support game development, Tetragon provides a complete foundation with that any type of game can be developed, incl. resource management, debugging facilities, multi-locale support, layered extendability, a game-oriented data structure, and a lot more.