CC BY-NC-SA does not permit the use of the software for commercial purposes. Thus it is not free for commercial purposes. This violates a few generally accepted principles of software freedom:

* Freedom 0 of the Free Software Definition: The freedom to run the program as you wish, for any purpose (freedom 0).

* Point 6 of the Debian Free Software Guidelines (DFSG): No Discrimination Against Fields of Endeavor: The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research.

* Point 6 of the Open Source Definition (OSD): No Discrimination Against Fields of Endeavor: The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research.

FSD: https://www.gnu.org/philosophy/free-sw.en.html

DFSG: https://www.debian.org/social_contract#guidelines

OSD: https://opensource.org/docs/osd

Fair enough. I have added the GPLv3 as an option.

Hence, non-free. Perhaps we are having a language confusion; here, I mean free as in freedom, not as in beer.

Fair enough. I have added the GPLv3 as an option.

Software that is free only for non-commercial purposes is considered to be non-free software.

Fair enough. I have added the GPLv3 as an option.