CLion, a JetBrains IDE, is now free for non-commercial use! Learn more in the blog post.

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CLion, a JetBrains IDE for C and C++ development, is now available free for non-commercial use. This initiative is in line with similar changes made to other JetBrains IDEs to support learners, hobbyists, and open-source contributors. The full IDE features remain accessible under this license with the exception of the 'Code With Me' feature. Non-commercial use includes learning and hobby projects, but a commercial license is still needed for commercial projects.

CLion Is Now Free for Non-Commercial Use

I’ve wanted it so long, used to have it as a student and now I can finally use it again!

How would non-commercial use specifically allow open-source? The open-source definition expliticly says that open-source software must be allowed to be used commercially (point 6):
<a href="https://opensource.org/osd" target="_blank" rel="noopener nofollow">https://opensource.org/osd</a>
This means, apparently, that while CLion can be used for open-source projects for free, it cannot be used open-source projects that are used commercially? How can one guarantee that the open-source project won’t be used commercially? An project that restricts this use would no longer be “open source” in the sense the term has been made famous.