My test results
If you can pay then
1) Agnitum Outpost 2.1 Firewall is "the" best.
2) Look 'n' Stop pro
or else
Kerio
Zone Alarm
Sygate
Go here to check which one of the free versions is the best.
*www.pcflank.com/art21.htm
IMHO free versions of all firewalls are useless. You can check how much protection you get from your firewalls (free or paid) by performing some leak tests. There are a total of 8 leak tests that can be performed. I have tested McAfee, Norton, Agnitum Outpost(free and Paid), Sygate(Free and Paid), Zone Alarm (Free and Paid).Out of these I list in descending order of score, when i tested them:
1) Agnitum Outpost 2.1 8/8
2) Kerio Pro 7/8
3) Look 'n' Stop Pro 2 6/8
4) Zone Alarm pro 6/8
5) Sygate Pro 6/8
6) McAfee Pro 4/8
7) Norton 3/8
Of all these the free versions of the firewalls were not nearly as good as the paid versions.
Only
Kerio,
Zone Alarm
Sygate
provided any kind of security.
In any way whenever you install any firewall i suggest you test them using the leak tests, and come to your own conclusion as to which is the best.
luckyrocker