PC-BSD is an operating system that is based on FreeBSD that aims to make the installation of KDE, LXDE, GNOME, and XFCE easier in a graphical interface. It uses files with the . It pre-configures desktop environments, video, sound, and networking so that the desktop can be used immediately.pbi filename extension (Push Button Installer). It has package manager that uses it to install the PC - BSD on the desktop.