One Month iOS - Learn to build your first iPhone app in just one month
hackattic - No nonsense, real world programming challenges
MevoFit Fitness Tracker - MevoFit Fitness Tracker is an app that is designed to be an all-in-one solution for your fitness needs.
Codewars - Achieve code mastery through challenge.
CodeTactic CMS - The CodeTactic CMS is a custom content management system based on PHP.
Real Dev - Real-life coding skill challenge