AdvancedTomato is described as 'A router's graphical user interface is the most important part of the system because most users are unable or unwilling to configure a router by any other means. Tomato comes with a dated web interface with the option to change the color scheme but for some of us that is not' and is a router custom firmware. There are nine alternatives to AdvancedTomato for a variety of platforms, including Linux, Mac, Windows, Self-Hosted and Tomato apps. The best AdvancedTomato alternative is OpenWrt, which is both free and Open Source. Other great apps like AdvancedTomato are DD-WRT, MikroTik RouterOS, Freshtomato and Gargoyle.
I have been using it with Asus n66u over 7 years,and is the best out there