Poltio - Create and share questions, get answers.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

ONDiGO - Seamlessly integrate your email & calendar to Salesforce

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.