Who Can Use - WhoCanUse is a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Cron Color - Free web tool for designing color palettes and checking contrasts.
Swift Playgrounds - Learn serious code on your iPad in a seriously fun way
Kontrast - Check and adjust web element contrast in real time.
Angle 2 Mockups - A giant Sketch Library for creating app presentations