Can You Write Software Using Tools From GPL And Sell That Program At A Profit?
Yes, the GPL allows everyone to do this. The right to sell copies is part of the definition of free software. Except in one special situation, there is no limit on what price you can charge. (The one exception is the required written offer to provide source code that must accompany binary-only release.)
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.
Selling Free Software - GNU.org
Can I use GPL software for commercial purposes?
Use of licensed software Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software, such as when using GPL-licensed compilers.
GNU General Public License - Wikipedia
Can you sell 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
Is it legal to sell GPL software?
With that said, dear TechRepublic reader, the short answer to your first question is: yes, you can legally sell software with a GPL license version 2 or 3 for whatever price you want to charge. The GNU project itself “encourages people who redistribute free software to charge as much as they wish or can…
Is it legal to sell GPL software? - TechRepublic