BuzzSumo - BuzzSumo allows you to discover the most shared links and key influencers for any topic. It's free to use and you can run a search in seconds!
Simply Measured - Simply Measured helps data hungry marketing & PR folks measure social media and create beautiful, custom reports in Excel and other formats.
GetSocial - GetSocial empowers mobile app marketing and product teams with growth tools to maximize user acquisition, engagement, and retention.
Frrole Scout - A complete social intelligence tool that incorporates Social Listening, Audience & Influencer Intelligence in a simple, elegant UI.
Crimson Hexagon - Big data platform for social media analytics and insights
Facebook Analytics - Facebook's new analytics app on iOS and Android