Vikiworks™ Studio

Here am I recommend you guys the “Vanilla“, an open-source, standards-compliant applied & various language support discussion forum application. Its capabilities includes Ajax, fully-extensible module management…blabla

It’s easy to set up and all you need is MySQL and PHP, most important it’s totally FREE! Vanilla also supports Add-ons, themes. I already downloaded a copy and upload it to my server to having a try, here is a setup screenshot, I’ll let you know how it work and its performance.

Check out Skillshare forum on Cssbeauty for an online version.