Twitter Search Fixer - Fix Twitter search by not accidentally clicking #hashtags
Refined Twitter - A browser extension that improves the Twitter experience
Tweak New Twitter - Reduce "engagement" and tone down some of New Twitter's UI
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.
ilo - Premium Twitter analytics
Simplified Twitter - The new Twitter, without distractions