Unity - The multiplatform game creation tools for everyone.
Dream - The savings lottery where you never lose
Godot Engine - Feature-packed 2D and 3D open source game engine.
Antichamber - "A game with half of the attention to detail and imagination Antichamber has would be a smash hit - this bare-bones first-person puzzler is one of the most thought-provoking, engaging, and challenging video games ever developed.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
The Talos Principle - Philosophical first-person puzzle game.