Online Armor free Firewall
Outpost free Firewall
PC Tools Firewall
Comodo Firewall
Sunbelt Kerio Firewall
ZoneAlarm free Firewall
Private Firewall
Windows Firewall
I use a Commercial Firewall (Built inside Antivirus etc.)
I dont use a Firewall
This is how I've configured Comodo
Firewall Security Level >> Custom Policy Mode
Defense + Security Level >> Safe Mode
Never had trouble with these settings
In addition have Eset Smart Security with MBAM as On-demand scanner
I'm a little paranoid and always like multiple layers of protection from malware
I use avast! IS,it have firewall.