Frontend Mentor - Supercharge your front-end skills by building in a real-life workflow. Solve real-world HTML, CSS and JavaScript challenges whilst working to professional quality designs.
Vanido - Vanido is a singing coach in your pockets.
A Product Design Challenge - Get a design challenge to solve real-world problems
Digital Library - Organize your books, track your reading and write reviews
Singscope - See your pitch analyzed as you sing
User Inyerface - A painful illustration of bad UX