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
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Basecamp - A simple and elegant project management system.