The best open source alternative to ENIGMA - LateralGM is GDevelop. It's not free, so if you're looking for a free alternative, you could try LÖVE or Wick Editor. If that doesn't suit you, our users have ranked more than 50 alternatives to ENIGMA - LateralGM and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to ENIGMA - LateralGM are Scratch (Free, Open Source), Ren'Py (Free, Open Source), Cocos2d-x (Free, Open Source) and Urho3D (Free, Open Source).
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
The Wick Editor is a free and open-source tool for creating games, animations, and everything in-between. It's designed to be the most accessible tool for creating multimedia projects on the web. Your creations can run on any device with a web browser - that means mobile too.
Adventure Game Studio (AGS) - is the IDE and the engine meant for creating and running videogames of adventure (aka "quest") genre. It has potential, although limited, support for other genres as well.
An open-source 3D/2D game engine for ObjectPascal. We support of lot of 3D and 2D formats (VRML / X3D, Collada, Wavefront OBJ, MD3, Spine...), we're portable to a lot of platforms (Linux, Windows, Mac OS X, Android, iOS...
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.