Best free firewall

[Shamim]

I want to download a free firewall. Which free firewall is the best for XP? I am using AVG anti-virus free edition,SAS Free Edition,Malwarebytes'  antimalware free edition, Spyware blaster. Which firewall is compatible with these software?

[soybean]

I'm not sure which is "best" but Comodo is a good one: http://personalfirewall.comodo.com/download_firewall.html

[Aegis]

Comodo is very user-friendly, too.  I've been very comfortable using it.

[kpac]

Definitely Comodo, in my opinion.

You could also try ZoneAlarm, or Sunbelt.

[Rob Pomeroy]

Quite a list here: http://freeware.wikia.com/wiki/Lists_of_freeware_firewalls

If you have some spare hardware lying around (doesn't have to be powerful or new), then there's always Vyatta for a very very high geek factor.

[kpac]

Quite a list here: http://freeware.wikia.com/wiki/Lists_of_freeware_firewalls

That is a nice list there. Here's another, "not-so-great" article: http://en.wikipedia.org/wiki/Comparison_of_firewalls

[2x3i5x]

and don't forget to disable windows firewall first before installing new firewall .... having multiple firewalls may cause computer problems (computer slowdowns probably or errors when the two firewalls may conflict.)

[evilfantasy]

I've shifted from Comodo to Online Armor

[2x3i5x]

I've shifted from Comodo to Online Armor

is online armor worth the price it costs?

[evilfantasy]

If you consider free a good cost then yes it is.

Note: All of the stuff not offered in the free version should be covered by your antivirus.

[ThomasTheXPUser]

I use Online Armor Free as well So far so good!

[2x3i5x]

So which firewall do you think I should use then? Online Armor or Comodo Firewall? Since both are free and right now, I have Comodo installed and it is working as advertised 

[evilfantasy]

See the latest Comodo issue to know more of why I no longer advise to use their software. This is just one reason. But a big one... Comodo continue to issue certificates to known Malware and Another Comodo Controversy

Not to mention the fact that Comodo have let their moderators and staff personally and sometimes viciously attack bloggers who report their increasingly unreliable business practices. Most of the attacks have been removed from their forums but a few still remain.

[2x3i5x]

So okay, Online Armor Free + Avast Home Edition (free) beats Comodo Free Firewall + Avast Home edition (Free)?

[evilfantasy]

Yes IMHO.