Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.
Unity - The multiplatform game creation tools for everyone.
Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
Godot Engine - Feature-packed 2D and 3D open source game engine.
Secret Maryo Chronicles - Secret Maryo Chronicles is an Open Source two-dimensional platform game and is using an Open Graphics Library for the best possible graphic design and stock performance.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.