hello mr. moderator, linux engineer

did anyone knows about firewall from http://www.mailbyte.net/iptables currently i am using it that firewall for my RedHat Linux 7.3 box and using wireless connection from my ISP. i just want to ask is that firewall have good ability to secure my network (HTTP access only, and FTP to transfer data from my branch office), or can you give some any firewall that have good any reputation (of course under GPL)