Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Kindful - Nonprofit donor database + fundraising tools all in one
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps