CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
SmallDevTools - Handy developer tools with a delightful interface
Classroomies - Watch Stanford CS & Startup lectures together
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Frond - A better way to build community online
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools