PhantomPost - Social media marketing application designed for small business
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
RiteKit Hashtag Suggestions API - Get hashtags generated for any block of text.
Hashtagify.me - Free hashtags search engine, with paid advanced analytics
SproutSocial - Sprout Social is a social media management tool created to help businesses find new customers & grow their social media presence. Try it for free.
HashtagWiki.com - Hashtag Generator Tool