hashtags.org - Hashtag is an extensive hashtag research platform for analytics and tracking of hashtags, providing...
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.
RiteTag - No idea which hashtags to use? Get instant hashtag suggestions for images and texts on desktop and mobile.
Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.