YouClap - Challenge and be challenged by friends and brands.
Spinnner - Challenge your friends to a spin-off (literally)
Pun Finder - Enter any word and get 'hilarious' puns to share
UXTesting - Discover how your mobile users feel
Pun-Generator.org - Online Pun Generator tool help users to generate hundreds of funny pun jokes with examples, It makes really generic and sensible puns for free.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.