Vamos - Local Event Discovery
Hypefury - No idea what to share on Twitter?
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
What to Tweet - Never again run out of Tweet ideas.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Toolset.com - The complete and reliable plugin for managing content types in WordPress.