Janetter - Janetter is a Twitter client application. Faster, smarter, and more powerful.
Spritz Bookmarklet - Speed-read on any website
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.
Reading Time - Tells you how long an article takes to read
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
Accelerator - Read faster, one word at a time