GNU/Linux & Unix
FreePOPs is mainly developed using the GNU/Linux operating systems. Since there are a bunch of distros, we try to provide packages for the most widely used.
FreePOPs is part of
apt-get install freepops
Francesco maintains a page with Fedora RPM packages.
Ubuntu and Kubuntu (amd64, i386)
Marco Giorgi provides up to date debs for Ubuntu and Kubuntu.
Davide maintains precompiled rpms for mandriva.
FreePOPs is part of the official Gentoo packages
Here you can find the slackware package, maintained by the slacky community.
Here you can find the openSUSE package, maintained by Andrea Florio.
Here you can find the unofficial packages for openwrt kamikaze maintained by Enrico Tassi. http://www.cs.unibo.it/~tassi/beta/freepops-openwrt/kamikaze/
FrePOPs should be portable to other Unices, like the *BSD family. Read the instructions for FreeBSD for those, download the sources, and build it yourself.
FreeBSD & OpenBSD
There are no prebiult binaries for FreeBSD or OpenBSD, but you should be able to compile the sources.
Explode the sources and type
$ ./configure.sh obsd
$ ./configure.sh fbsd
and then type
$ gmake all && gmake install
To build the pdf manual you must have latex, dvips and ps2pdf installed.