Microsoft Advertising - Use our search engine marketing and audience solutions to help you build your business.
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
WordStream - WordStream offers a suite of products to help companies with their SEO and SEM initiatives.
HashtagWiki.com - Hashtag Generator Tool
Kenshoo - Kenshoo provides marketing software and empower marketers with technology to build brands and generate demand across all media.
Hashtagify.me - Free hashtags search engine, with paid advanced analytics