itch.io - An online game marketplace and community.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Roblox - Reimagining the way people come together.