YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android
Babble - A more personalized social network
Echofon for Twitter - Download Echofon apk 3.1.3.3 for Android. Echofon for Android - A super clean Twitter app
Palaround - Meet people you should be friends with.