Can Free Software Be Sold?
Selling a copy of a free program is legitimate, and we encourage it. However, when people think of “selling software,” they usually imagine doing it the way most companies do it: making the software proprietary rather than free.
Can free software be licensed?
The following licenses are published by the Free Software Foundation: GNU General Public License (GPL) GNU Lesser General Public License (LGPL) GNU Affero General Public License (AGPL)
Free Software Licensing Resources
Can I sell an open source software?
Absolutely. All Open Source software can be used for commercial purpose; the Open Source Definition guarantees this. You can even sell Open Source software. However, note that commercial is not the same as proprietary.
Frequently Answered Questions - Open Source Initiative
Can I sell my GPL software?
4. Can you sell GPL software/code? Yes, the GPL license allows users to sell the original as well as the modified software. It may be confusing, but free software is referred to as free in terms of freedom and not in terms of price.
GPL License - Top 10 Questions Answered - Mend
Do free software licenses qualify for open source?
As far as we know, all existing released free software source code would qualify as open source. Nearly all open source software is free software, but there are exceptions. First, some open source licenses are too restrictive, so they do not qualify as free licenses.
Why Open Source Misses the Point of Free Software - GNU.org