Check I'm Here - Manage, Track, Assess, & Engage Student Life On Campus
SmallDevTools - Handy developer tools with a delightful interface
Acascope - Free and complete school management solution
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
KenHub - Use Kenhub to learn anatomy
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools