Mockupea - Mockupea is an online tool for creating 3d book mockups with a lot of features.
Squat Captcha - The worst captcha ever! Forces you to do 10 squats
Stackoverflow '90s - Bring back '90s to Stackoverflow with this extension
Metal Captcha - A captcha form for metal fans
Box Shadow Generator - Generating CSS3 multilayer box-shadow has never been easier.
O RLY Cover Generator - Create parodies of the iconic O'Reilly book covers