Flock - A faster way for your team to communicate
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
SocialRank - Graph search for TWTR. Filter by interests, location, etc
Botometer for Twitter - Intelligence tool to check if a Twitter account is a bot
Accountanalysis - A tool to evaluate Twitter accounts
Twitter Bots - Make smart Twitter bots without coding