I read the SourceForge TOS and it seemed to say the license has to be OSI approved one, but then it has what I think is an exception;http://sourceforge.net/tos/tos.php
Use, reproduction, modification, and other intellectual property rights to data stored in CVS or as a file release and posted by any user on SourceForge.net ("Source Code") shall be subject to the OSI-approved license applicable to such Source Code, or to such other licensing arrangements that may be approved by SourceForge.net as applicable to such Source Code.
And this from some FAQ;http://gro.clinux.org/docs/site/faq.php#whohost-com
Can I host commercial software on SourceForge?
If your commercially developed software is Open Source, then yes.
If your commercially developed software is not yet Open Source, but will be later, then probably yes.
If your commercially developed software is not Open Source, but may help to advance other Open Source software, then maybe.
If you just like our tools so much that you want to use them, then go ahead. We've released them as Open Source software. If this prospect overwhelms you, then contact VA Linux Professional Services, they'll be glad to help you. (Shameless plug for our sponsors.)