>1. Firestarter

This is a rich featured and user friendly firewall application, Firestarter provides many advance features like ICMP filtering, Service filtering, Internet connection sharing, local DHCP server.. making it a must have application for any Linux desktop installation

2. Gufw

A popular front-end for ufw (Which is a front-end for iptables) firewall application, You will find this installed by default on Linux Mint, Configuring a firewall is now easy as pie.. Gufw is the most easiest configuration tool for firewall you will ever see, However it serves very limited amount of functionality.
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3. Guarddog

I like this configuration utility since I used it for first time. Guarddog allows to configure advance firewall with few clicks, besides that It also supports configuring firewall through presets for different services and protocols.. If you don’t know about networks too much, you can think about Guarddog

4. KMyFirewall

KMyFirewall is a front-end for iptables, However its not completely user friendly. because you need to write the iptables rules using GUI, then apply them. You can use KMyFirewall for creating complex firewall rules. but until you don’t have enough knowledge of iptables. it can difficult to use KMyFirewall for you.