The first freedom guarantees that you can use the software as you wish, for any work, either it’s commercial, or personal, or non-profit. Works made with the help of our tools are yours, and you can do what you want with them.

You don’t need any authorization or contract. Download, install, have fun!

Just know that we’re very curious to see what you’ve made with our tools, so you can send us the result of your work! You can help the development of the free tools too, with a donation.

Of course, you have the same rights whether you make a donation or not. Not everyone can afford to give some money, and we’re fine with that. Note that we welcome any kind of contribution, there’s always something to do, like translations, fixing bugs, contributing to the doc, creating examples and tutorials…

The second freedom lets you change the software as you need. The source code is always available.

The third and fourth freedoms let you share our tools and distribute them yourself, with or without your changes. However, in order to keep those four freedoms, the GNU General Public License restricts the release of the tools (including your changes) under a compatible license, one which guarantees these four freedoms too. Thus, you can neither sell the tools, nor keep the source code private. You must list all the authors of the free software you share and change too. In short, the tools, with or without changes, must stay free.

If you include any part of the source code of our tools – even a short part – in your own tools, they must be released under a free software license too. You cannot sell any software, including some code licensed under a free license.