Moleskine Smart Notebook - Turn hand-drawn sketches into fully workable vector files
Unity - The multiplatform game creation tools for everyone.
Action Method Notebooks - Notebooks for making ideas happen
Godot Engine - Feature-packed 2D and 3D open source game engine.
Notebook.ai - A smart notebook that grows and collaborates with you
Blender - Blender is the open source, cross platform suite of tools for 3D creation.