Twitonomy - Twitter analytics and much more.
hashtags.org - Hashtag is an extensive hashtag research platform for analytics and tracking of hashtags, providing...
Hashtag Finder - Find popular hashtags you should use for your social media posts in order to get the most visibility.
ExportData.io - Export Twitter data for your business needs.
Hashtagify.me - Free hashtags search engine, with paid advanced analytics
Twazzup - Real-time Monitoring and Analytics for Twitter.