sample forums

These are some sample forums that can be used for UI inspiration:

http://www.happierabroad.com/forum/index.php
http://defendingthetruth.com/political-forums.php
http://www.groin.com/index.php?board=2.0
https://lumineboreali.net/
http://freedomofspeech.yuku.com/
http://www.vbulletin.com/forum/

Also this is the most popular hosted forum:

https://www.proboards.com/