GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Udemy - Online Courses - Learn Anything, On Your Schedule
itch.io - An online game marketplace and community.
Adobe Captivate Prime LMS - Adobe Captivate Prime LMS is easy to setup and helps in delivering engaging learning experiences in a personalized manner across devices.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!