PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Hexen II - The Hammer of Thyrion project is a cross-platform source port effort of Raven Software's Hexen.
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
Black Mesa - Black Mesa is a third-party remake of Half-Life developed and published by Crowbar Collective.
Clever - syncing between education applications for K-12 schools
Quake - Quake is a series of first-person shooter video games released by id Software.