PBWorks is a wiki based real time collaboration platform that started in 2005 as PeanutButterWiki. As time passed, it became increasingly obvious that wiki as a collaboration platform for academia and businesses is not as good as social network or social intranet. That coupled with $30/user/mo commercial license price tag, more or less sealed PBWorks fate. A collaboration tool with no native mobile apps in 2014, really? If you are looking for a free PBWorks alternative that comes with 35+ social collaboration tools, Bitrix24 makes a great choice.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.