What is FreeBSD?
FreeBSD is a Free Software operating system distributed under the 2-clause BSD license. The FreeBSD website has all the information needed (especially the handbook) to install and configure FreeBSD itself.
KDE on FreeBSD
The KDE on FreeBSD website is supposed to be the definitive source of information.
This wiki page will be used to collect compilation hints, debugging tips, etc. Additional information can be found on the FreeBSD KDE4 Wiki.