Twitonomy - Twitter analytics and much more.
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
Twazzup - Real-time Monitoring and Analytics for Twitter.
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.
HashtagWiki.com - Hashtag Generator Tool