Nextdoor - Nextdoor is the private social network for your neighborhood.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Peanut - Peanut is a Mobile Application for moms developed and published by Peanut App Ltd.
Bigtent - BigTent is a web-based organization and communication portal for groups.
Zoho Cliq - Team chat that's built for work
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.