hashtags.org - Hashtag is an extensive hashtag research platform for analytics and tracking of hashtags, providing...
tripcake - Doodle for travel plans with friends
HSHTG - Generate, manage, save and edit hashtags just in a few finger tap
DUNK - Surprise your friends with secret group plans
RiteBoost - Auto-hashtags, Auto-emojis, GIFs and much, much more, all according to your Enahce rules.
Howbout - Social calendar app to easily make plans & find availability