itch.io - An online game marketplace and community.
Unity - The multiplatform game creation tools for everyone.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Ubisoft Club - Ubisoft Club app enables you to get updates about your favorite games timely.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.