The best open source alternative to Unreal Engine is Godot Engine. If that doesn't suit you, our users have ranked more than 100 alternatives to Unreal Engine and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Unreal Engine are GDevelop, Redot Engine, Armory 3D and microStudio.
Platinum Arts Sandbox Free 3D Game Maker is an open source free game maker, free RPG Maker, free sidescroller maker, free Machinima creator, and game design tool that makes it easy for kids and adults to create video games, maps and worlds.
Gameeky lets young learners and educators create and explore cooperative games and learning experiences.
FPS Creator sets a new benchmark in the game creation market by providing an easy-to-use yet highly flexible editing environment. As its name implies this is a tool for creating action-packed FPS games with no programming or 3D modelling knowledge required.
An unofficial client to install Unreal Engine, download and manage purchased assets, projects, plugins and games from the Epic Games Store.
Whitestorm.js is a framework for 3D web apps built with Three.js technology. It implements a core for fast development of a 3D scene with physics.
Amulet is a free Lua-based audio/visual toolkit suitable for small games and experimentation. It runs on Windows, Mac, Linux, HTML5 and iOS.
Limon is a multi platform 3D game engine mainly focusing on first person games. Focus of its development is ease of use and ease of study. It has builtin editor for maps, animations and GUIs.
A cross-platform 2D game prototyping framework based on OpenGL and C++.
Angel balances the speed and flexibility of native code with an eye towards rapid iteration and out-of-the-box functionality. In a world of web games and memory-managed scripting engines, sometimes you still.
Reality Factory 2 is a next-generation game authoring suite. It combines a flexible, fully scripted game development environment powered by Python with the Ogre3D engine, and supports all major desktop operating systems.
LittleJS is a fast lightweight open source HTML5 game engine for modern web development. Its small footprint is packed with a comprehensive feature set including hybrid rendering, physics, particles, sound effects, music, and input handling.
MAGE stands for MAKE A GAME EXPERIENCE
The goal for MAGE is to make it as easy as possible for people to create their own 3D universes, adventures and stories. PLAY WHILE YOU CREATE!.
United States
Paraguay
United Kingdom
Russia
This is more a game than a game engine.