ENIGMA – LateralGM - LateralGM is a powerful IDE for ENIGMA, and both of these combine to offer you a cross-platform game environment.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
G3D Innovation Engine - The G3D Innovation Engine is a commercial-grade C++ 3D engine available as Open Source (BSD...
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Quest - Quest lets you create sophisticated text-based games, without having to program.