what is postNuke for?

[J.C. Diosdado]

Hello,   I have to develop a web site with web services like forum´s, ftp services, mail services, etc. Something like web site http://groups.msn.com/   Is postNuke my tool  to develop this?   Where can i found informatión about it´s posibilities, and funcionalities. ? Is there any other option in Linux?   Thaks!