Askbot
Askbot is open source software used to create question and answer oriented Internet forums. The site started in July 2009,[2] initially similar to Stack Overflow or Yahoo! Answers.[3] Based on CNPROG[4][5] and some code written for OSQA, it is primarily developed and maintained by Evgeny Fadeev.[6]
Websites use Askbot to run their Q&A sites. Askbot can be easily installed by using the documentation[7] on Ubuntu and CentOS.
The Document Foundation put some funds in AskBot development.[8] and LibreOffice used Askbot for Q&A but they decided to migrate to Discourse,[9] as Fedora had done before with its Q&A.