Hi all
I am not sure if this topic is in the write forum or not
but I shall tell u my idea first
I want to make a RouterOS like mikrotik : http://www.mikrotik.com/ i know mikrotik is not free
and I want to make my program free (GNU license) and is easy to use and with good GUI
but me alone will be impossible
I don't know where to begin from and what languages should i program in
I know a lot of programming languages and i did a lot of projects with them
I know C/C++,java,assembly
scripting languages : perl,TCl/TK,lisp,shell
I want it to be a project like the kernel or any popular software
I want some directions so i can start and i wish to have also some programmers to help
wish to find some help here
thanks all for your time

Well you can just make a mikrotik clone then... get any distro, strip it down and install quagga on it. one Mikrotik clone.

ok lets choose Ubunut as a OS
how could i strip it down ?
and is there any possibility to develop with quagga?

First, spend the next couple of years on this: "how could i strip it down ?" Then you'll know enough to start adding in what is needed to create your routerOS. Maybe you should look at openWRT (which is an open-source routerOS), to start your studies.