Yes, as long as you are the owner of the copyright on the source code, or have permission from the owners to do so.
There is a lot of open source gpl'd projects which also would give you a commercial license, if you do not want to play along the GPL license burden.

Cesc

On 10/1/05, Roy Sigurd Karlsbakk <roy@karlsbakk.net> wrote:
hi

i just came by http://www.iptelorg.de/SOP.php, and it's quite clearly
SER, but then, on the downloads site, it tells me "This site offers
only commercial products and services . Please follow the links below
if you wish to find support related to respective software".

although their stuff looks good, can you really make GPLed code a
"commercial product"?

roy

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