Is It Legal To Sell Open Source Software?
Yes - as long as you make your modified source code freely available, under the same license, you're allowed to sell the software (for example in binary form).
Can open source software be commercialized?
Open source software can be used for commercial purposes. This means you can use open source software for commercial purposes — but you can't always place restrictions on people who receive software from you. And commercial doesn't mean the same thing as proprietary.
Using Open Source Code in Proprietary Software | Perforce
Can you charge for open source software?
Open source software is free, but many businesses are happy to pay for support. This model tends not to scale well, however, making wider deployment expensive.
Should you pay or should you go for free open source software?
Can you 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.
Frequently Answered Questions | Open Source Initiative
Is it illegal to use open source software?
If you want others to use, distribute, modify, or contribute back to your project, you need to include an open source license. For example, someone cannot legally use any part of your GitHub project in their code, even if it's public, unless you explicitly give them the right to do so.
The Legal Side of Open Source