[otrs] KnowledgeBase Support

I'm curious if anyone has implemented a knowledgebase into OTRS. I work for a non profit organization and have been researching the different open source trouble ticket software and am stuck between OTRS and HelpDesk OneZero (http://helpdesk.oneorzero.com/). On the other hand I enjoy the support/documentation that you guys offer but this onezero software has a knowledgebase that I haven't seen in OTRS, which would be great for my work. To conclude and reiterate, has anyone implemented a knowledgebase into OTRS like this OneZero software. And What other reasons would you guys give as to why you would recommend OTRS over this other software? thanks marshall