Invision Community - Invision Community is a flexible, integrated set of apps for building communities on the web.
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
Kindful - Nonprofit donor database + fundraising tools all in one
Mobilize - Mobilize is a scalable messaging app built for large groups.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps