I have a question about the possibility of using os.js in projects. Nowhere outside the main site I did not find out about it. Theoretically, the main page is written “Free and open-source”. Can I use Os.js as the primary environment (Client Panel) for my commercial site?
OS.js is completely free under the BSD license.
You can use this pretty much any way you want with the clauses noted there… basically you have to link to this original license somehow and do not remove them from the sources.