itch.io - An online game marketplace and community.
Brain Games - Boost memory power with free brain games
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
JobFlare - Brain games for job seekers
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Hue Brain Games - Play interactive games with your Philips Hue lights