GOG.com - DRM-free game store, selling both new and old titles. No clients required.
PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...
itch.io - An online game marketplace and community.
Spyder - The Scientific Python Development Environment
Epic Games - Computer game storefront that gives 88% of revenue to developers
Thonny - Python IDE for beginners