ShellTer is an iptables-based firewall. What sets it apart from the rest is that it has built-in SSH brute force protection. It is easy to configure and has an interactive CLI installer.
Very easy to use shellter
very good project
with OOO.org and Evolution both available on windows, why bother with the licensing for Office. just remember to contribute $$ to the projects so they continue to enhance and develop. TuxLuv --Open Source rules