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.

Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.

Twitterrific - Twitterific is an app that offers several functions and fun features for your Twitter account.

Plume - App for writing documents, scripts, books and more.

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

Hibari - Hibari is a simple yet powerful Mac Twitter app that blocks unwanted tweets and combines important tweets into a single timeline.