RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Unity - The multiplatform game creation tools for everyone.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Godot Engine - Feature-packed 2D and 3D open source game engine.
mangobox.ai - Visual novel maker powered by AI
Blender - Blender is the open source, cross platform suite of tools for 3D creation.