Since Linux is a free software is it possible to sell products developed on Linux and what are the restrictions/license agreements that need be considered?

There's a great FAQ here which covers GPL, however there could be any number of licenses to consider depending on which libraries etc you use.

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it is possible since android phones, some blue ray players/ tivo, wifi routers, ... use the linux kernel. i think the major consideration is that any open source software you use must be made available to others.

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Thanks for the reply schneidz, kbp.I am asking about if I develop a specific application on the Linux Platform which involves say doing the package on say C/C++ or Java and this application I would like to market as a product what would be my responsibility vis a vis teh OpenSourceForum commitment. What am I expected to share? The source code of my entire application? For instance when I browsed throughthe Source Forge site I found that there are a lot of S/W packages developed by individual programmers like some PCB-CAD, some Neural Network package etc., which they have put it on the site. Supposing this were the efforts of those people for commercialization, forcing them to share the same for free would it not make the effort a waste of time? Please clarify. I have to invest time on Linux to do something commercial. Is it worth the effort at all is the Q? I understand if i develop some enhancement to say the GUI I need to return to the community the same. This I understand.

Checkout this- http://www.gnu.org/philosophy/selling.html

apple os-x and ios are based on bsdi kernel. check out:
http://www.apple.com/darwin

they share all portions of code that isnt theirs and they manage to turn a decent profit.

If you built it from sources then you might be able to sell it. As above every license needs to be clearly read and understood.

It is much easier to be legal if you purchase an existing product that is marketed to OEM's.

Linux is not exactly free. It may be free to download for some users but corporate use and selling of it are not the same at all.