What is the best firewall software?

Please tell me what is the best firewall software and why?

I cant speak for all but following Firewall Software i used in the Past ... and i was satisfied with it :

- Zone Alarm (is available as a Freeware and as a Full Software Package)!
The full Software Package has some extra Features ... but the freeware
Version is also ok! Both are very easy to handle ... thats why i
recommended!

thanks but I've had some bad experiences with zone alarm. I had to delete it because it started blocking all Internet traffic after my computer was restarted for five minutes. It was very strange and I couldn't figure out why it was doing that.

I have used zone alarm for 6 yrs with no problems, that is why when you download it it walk you through it to set it it up and show you how.

The trial version for www.winpatrol.com work rather nice along with itfuctndacabesa wrote:

Kerio is good, light, and easy to use.

Outpost is the best, but there is no free version

Keiro or Black Ice.

Even better is to get a SOHO router with built in firewall. not expensive.