tripcake - Doodle for travel plans with friends
hashtags.org - Hashtag is an extensive hashtag research platform for analytics and tracking of hashtags, providing...
DUNK - Surprise your friends with secret group plans
HashtagWiki.com - Hashtag Generator Tool
Howbout - Social calendar app to easily make plans & find availability
RiteBoost - Auto-hashtags, Auto-emojis, GIFs and much, much more, all according to your Enahce rules.