Slack - A messaging app for teams who see through the Earth!
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Confluence - Confluence is content collaboration software that changes how modern teams work
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Flock - A faster way for your team to communicate
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.