Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Nextdoor - Nextdoor is the private social network for your neighborhood.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Peanut - Peanut is a Mobile Application for moms developed and published by Peanut App Ltd.
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Zoho Cliq - Team chat that's built for work