"I walk up to the home or business, my iPhone says a wifi is available. I log in. I open my browser and a web page opens with info about the home for sale or business. I can click more links to get more info just like the internet but just info about this home or business. " I want to develop the above myself but I am new to this. I want to produce the above and sell it as an all-in-one device. This is an intranet device only. I am a web developer but not a linux coder. I want to modify the the basic firmware for a ASUS WL-520GU and make my product write backups to the USB drive using a SD Plus card ( USB SD Card which I have ). Question. Where are the development tools to take the GPL firmware that removes the Tomato interface ( non-GPL ) and let me make my own web interface and add USB support? Thank you.