Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Kickstart CSS - The CSS Library that Loves to Be Extended
Gravity Free - Gravity Free – Light Particles Manipulation App developed and published by Kfirapps Limited.
Foundation - The most advanced responsive front-end framework in the world
Particlescape - Particlescape app lets you create stunning patterns at your fingertips.