Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Kalam Labs - Twitch for Science
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
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).
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.
Littlecodr - Insanely fun card game that teaches kids the basics of code