Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.

Reverse Dictionary - Describe a concept and get back a list of words

Palaround - Meet people you should be friends with.

Silicon Valley Dictionary - Urban dictionary meets Silicon Valley

Babble - A more personalized social network

Dictionary Anywhere - Dictionary Anywhere is an open-source and easy-to-use browser extension for Mozilla Firefox and Google Chrome that allows you to check definitions easily while browsing the web.