Kalam Labs - Twitch for Science
Wikids - An encyclopedia that talks to your kids
RunaWFE - RunaWFE Free is a free Open Source BPMS (business process management system), which serves to optimize and automate business processes (for Windows, Linux, Mac OS).
Litnerd - The Pixar for education, reading program for K-5 schools
Pili Pop - Great language learning method for kids
Littlecodr - Insanely fun card game that teaches kids the basics of code