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.

BrandBird - Brand your Twitter content uniquely

TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.

Bluebird by American Express - Say hello to Bluebird by American Express and Walmart.

HootSuite - Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.

Hivoe - Engage with your audience on Twitter automating your Direct Messages