Almabase - Build a powerful and engaging alumni website. For Free!
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Rememble - Rememble is a 'washing line' for your digital bits and pieces.
Kindful - Nonprofit donor database + fundraising tools all in one
Octopress - A static blogging framework for hackers, based on Jekyll
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps