Twitter Amplify - Twitter Amplify enables media companies and brands to capture TV content and distribute it to fans and audiences across Twitter.
TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Tweet Activity Dashboard - Real-time impressions & engagements of your Tweets
Twitterfall - Twitterfall is an excellent choice if you want something basic, free and without much branding.
Retweet Ninja - Retweet Ninja allows to efficiently schedule recurring retweets on your network of Twitter pages.
Tweetdeckr - Tweetdeckr is an open source Tweetdeck replacement client.