You can install extra packages for FreeBSD by using the ports system.
If you have installed it, you can download, compile, and install software by
just typing
	# cd /usr/ports//
	# make install && make clean
as root.   The ports infrastructure will download the software, change it so
it works on FreeBSD, compile it, install it, register the installation so it
will be possible to automatically uninstall it, and clean out the temporary
working space it used.  You can remove an installed port you decide you do not
want after all by typing
	# cd /usr/ports//
	# make deinstall
as root.