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Yes, because it's not freeware with an EULA. It's GPL (which, by definition, is the "anti EULA" )
You can download Gimp, put it on your website and sell it. No one can sue you. It's immoral if you don't help the developers, but it's perfectly legal. Edited 2008-07-10 15:03 UTC
The GPL is indeed an EULA, it's just quite permissive, but you can also get sued if you break it (fx. don't provide the source code).
Any license can be considered an EULA (end user license agreement). After all, if you use the software, you are an end user. The point is that most EULAs regard the user as a software consumer, aka typical desktop user.
GPL and Open Source licenses are directed more towards developers, contributors and distributors of software. All of which are more than just "mere" end users.
And you can get sued for breaking any license.
The point is that you can sell Open Source programs, even if you did not code them (for example Ubuntu wrote probably less than 0.00001% of the OS). Without breaking the license (you just have to put a zip/tar.gz on your website containing the sources). Edited 2008-07-11 13:13 UTC