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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.
Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)
MIT Licensed Open Source version of Torque 3D from GarageGames
KlayGE is a cross-platform open source game engine with plugin-based architecture.
Intrinsic is a Vulkan based cross-platform game and rendering engine. The project is currently in an early stage of development.
A free JavaScript game engine library with a web-based comprehensive suite of toolset for making HTML5 games. http://www.qiciengine.com
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
Vulkan header generator, OOP-style API wrapper, framework and prospective Vulkan-based game engine for Object Pascal
Create Flash, HTML5, iOS, Android, and desktop games with no code with Stencyl. This is the source to Stencyl's Haxe-based engine.
voxeliq is an open source block-based game engine implementation developed with C#
Plugin-based client-server voxel game engine written in D language
A modular roguelike engine for LÖVE, licensed under the MIT license.
A Pikmin-based game/engine for fan-made content.
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.