Sale of FREE GPL products - the new fashion trend

GPL license

GPL license defines that a product could be used free. 

GPL characteristics:

• Can be used commercially
• Can be modified
• Can be distributed
• Cannot be sub-licensed
• Cannot be hold liable 
• MUST disclose source
• Not forbidden GPL software to be sold. 

So what is getting so popular is that software providers start selling the software. Why? Because they are not forbidden to do so.

Customers could obtain source code freely but most of them do not know it, so they buy it. For really high price.

Examples

WPML - translation plugin for Wordpress

It is a GPL software because:

1 - https://web.archive.org/web/20220627211111/https://wpml.org/faq/limitations-on-using-wpml/

2 - https://wpml.org/purchase/pre-sales-questions/comment-page-276/

* search for "GPL" string

* archive of the page

Pricing the developer choose - https://wpml.org/purchase/

Polylang - translation plugin for Wordpress

It is a GPL software because

1 - https://polylang.pro/doc/which-license-applies-to-your-products/

• archived version

Pricing page

More GPL products being sold?

If you know more GPL products that are sold, tell us about them in comments.