PeerReach: PeerReach analyses your connections and interactions to determine your interests, expertise and who is most relevant for you.
Kred: Measure your Influence with a Kred Score and join the Kred Network with a .Kred Address.
Klear (formerly Twtrland) Klear is a social intelligence platform that helps you do smarter marketing.
Influence: An open platform for influencers to profile their best work. Brands and agencies can use the tools for finding and work with influencers.
Tweeple Search: Helps you find highly relevant audience & powerful influencers for your business on Twitter.