Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Kindful - Nonprofit donor database + fundraising tools all in one
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.