studentraiders - Buy, sell & trade in a cool and convenient way
NoteBear - Buy and sell class notes and get on-demand tutoring.
Check I'm Here - Manage, Track, Assess, & Engage Student Life On Campus
Stanford Nerd - Text a Stanford student and get help
CollegePlus - Higher Education. Customized.
Teech - 24/7 Unlimited help from the world's best students