TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
TweetCaster - TweetCaster is a third-party Twitter mobile app that is available on Google Play and the Apple App Store.
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android