vdNote - Share noteworthy moments from YouTube videos.
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
YouDict - YouTube dictionary to search words, expressions & names
HashtagWiki.com - Hashtag Generator Tool
Summary Panda - Remove annoying 'blah blah blah' parts of YouTube videos.
Hashtagify.me - Free hashtags search engine, with paid advanced analytics