Hashtagify.me - Free hashtags search engine, with paid advanced analytics
Twidy App - Tinder for Twitter - Tidy up and declutter your timeline
HashtagWiki.com - Hashtag Generator Tool
Shipstreams - A list of makers shipping live
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
Vanilla Timeline for Twitter - Browse Twitter without the some-user-liked tweet clutter.