Frost for Facebook - Frost is a third party Facebook wrapper geared towards design and functionality
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Face Slim - Web App for Facebook. Lightweight, ad-free, chat support and modern look.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
SlimSocial for Facebook - Slimsocial For Facebook free download - Facebook Pro, Facebook Desktop Messenger, Facebook Lite, and many more programs
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android