Yak Tack - remember. words.
Idea Hunt - Solve specific challenges for your favorite products
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
OpenVC - 2200+ VC firms by thesis to find 'best fit' for your startup
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
Idealist - Volunteer, work, and intern job search