Mobilize - Mobilize is a scalable messaging app built for large groups.
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Kindful - Nonprofit donor database + fundraising tools all in one
vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps