Freebsd – Firebird on FreeBSD

Way more programs you can find in FreeBSD's ports collection. First you need to checkout ports.

portsnap fetch extract

then ones a day/week/month you should run portsnap fetch update to update collection (not programs them selfs)

After ports are extracted you can find one you want and install it:

cd /usr/ports
make search name=isc-dhcp
cd /usr/ports/net/isc-dhcp31-server
make install clean

PS. And it'll be good to read handbook first

The FreeBSD Handbook is your friend for all basic questions.

The ports tree and the pkg_* system are one in the same. There are also additional pkg_8 management tools in the ports tree if the built-in ones aren't enough.

Upgrading will depend heavily on your environment, but can be as easy as cd /usr/src; make buildworld; make installworld and horribly complex in the opposite environment.

The FreeBSD Security Team determines how long releases are supported (bug/security fixes). Scroll to the bottom of their page for the current schedule.

Same gotchas as most other *nix OSes; if you're familiar with Debian, you should be familiar with many already. If you have additional or more specific questions feel free to ask.