Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android
Frost for Facebook - Frost is a third party Facebook wrapper geared towards design and functionality
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
Tinfoil for Facebook - Download Tinfoil for Facebook app for Android. Tinfoil for Facebook is for those users that require a Tinfoil hat. .
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Facebook Lite - Facebook Lite is a light and small size app that contains all the classic features of the Facebook app such as timeline, liking or commenting on photos and other such simple features.