Simple Port Forwarding works with WebPages and not directly with your router.
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The program has many extra tools, such as a tool to set your IP to static or back to DHCP. When port forwarding the router forwards to an IP address.
When DHCP is enabled your IP address can change and thus breaking the port forwarding. By setting your IP to static it never changes. I added this tool to make setting a static IP as easy as possible for people instead of manually doing it on there systems (Which if a person has never done it before can be a little intimidating). The Program also makes adding the ports to the windows firewall as easy as a few clicks! Once you have your ports forwarded you can then test to see if they can be accessed right from with in the program using the built in port tester.
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Free
Really handy - provided your modem is on the 'supported list'. The good news is - the developer (Shane) provides instructions and software to get the info he needs to add new modems for the software.