Pixorize - Browser-based image annotation and sharing
Complete Anatomy - Groundbreaking platform for anatomy education and reference.
Picmonic - Picmonic transforms forgettable facts into memorable stories and characters
Lecturio - Medical course and video lecture delivery platform
osmosis.org - Huge library of clear, concise medical videos
Sketchy Medical - Sketchy uses stories & pictures to make hard to remember facts a lot more memorable.