Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Iris - The fastest web framework for Go in (THIS) earth
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Citizen - Stay safe with instant alerts about nearby crime
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Guardians - A safety app for women