Khicas.tns and luagiac.luax.tns and xcasnws.tns are covered by the GPL license.
Source code is included in the giac distribution, available at
https://www-fourier.univ-grenoble-alpes.fr/~parisse/giac.html (English)
or https://www-fourier.univ-grenoble-alpes.fr/~parisse/giac_fr.html (French)
More info (French) at https://www-fourier.univ-grenoble-alpes.fr/~parisse/ti/khicasti.html#sec44

ptt.tns is closed-source.

upsilon.tns is covered by the
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

