Tweetbot
Whether you're tired of the stripped-down functionality of Twitter's native iOS app, or you're just ready for something new, Tweetbot ($3) has just updated their iPhone app, and it's better than ever. Most noticeable for those of you who have used previous versions of Tweetbot are the design changes, as it now looks much more at home on iOS7 with a paired-down, minimalist white interface, rounded avatars, new animations, and transitions. They've also made it simpler to use, getting a lot of the chrome out of the way in favor of a content-first focus. It now takes fewer swipes to view profiles, and see conversations, while some of the same features you've always liked are still present (muting functionality, customizable screens, and much more).