Which Firewall i can use with Avast! free antivirus?(Except Windows Firewall)Any sugesstion? 
Eddy
2
Any hardware firewall can be used and about all (free) software firewalls.
Pondus
4
the least complicated, Windows firewall and turn on your router / ISP box firewall if not already on
Mike23
5
Be Secure…
You could always try the “best” free firewall…
http://tinyurl.com/o3q3tu3
The Comodo free firewall link is soooooo long, I had to use the “tinyURL” site to shorten it. 
Been using Comodo for years & never had a problem with either it or getting anything nasty on my M/C.
It does exactly what a good firewall should.
Stay safe.
Pondus
6
Be Secure, Google is your friend. Search “Free Firewall Software”/and Reviews.
Do some research, and you’ll quickly get to know what’s available.
As far as commonly used Free Firewalls by Avast users here on the Forum, Ive noticed these:
OutPost FW
Private FW
Comodo FW
and there’s others. 