What is the license(s)?

Hi.

No COPYING(.txt), no LICENSE(.txt), no COPYRIGHT(.txt), and nothing about the license in the README file. Is it free/libre software? More precisely, what is the license(s)? Does it have at least 1 non-free dependency?

If you do not know what free/libre software is:
https://www.fsf.org/blogs/rms/20140407-geneva-tedx-talk-free-software-free-society
https://www.gnu.org/philosophy/free-sw.html

If you are looking for a license, you may be interested by this list:
https://www.gnu.org/licenses/license-list.html

Regards.