ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.

Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.

Proboards - ProBoards is a host of free forums with customer service.

Kindful - Nonprofit donor database + fundraising tools all in one

Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android

Classy - Expressive, flexible, and powerful stylesheets for native iOS apps