SmallDevTools - Handy developer tools with a delightful interface
Awesome Computer Science Opportunities - Resources for computer science students
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Stanford Nerd - Text a Stanford student and get help
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools
NoteBear - Buy and sell class notes and get on-demand tutoring.