HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
HashtagWiki.com - Hashtag Generator Tool
RiteBoost - Auto-hashtags, Auto-emojis, GIFs and much, much more, all according to your Enahce rules.
Hashtagify.me - Free hashtags search engine, with paid advanced analytics
Hashtag Finder - Find popular hashtags you should use for your social media posts in order to get the most visibility.
Twitonomy - Twitter analytics and much more.