Mercurial - Octave

Mercurial (sometimes referred to as hg) is the source code management system used for Octave development.

Everybody is free to run, copy, distribute, study, change and improve^[1] Octave's source code, given in the main repository at https://www.octave.org/hg/octave. Use Mercurial to get the latest version of Octave

hg clone https://www.octave.org/hg/octave

TortoiseHg is a GUI for Mercurial and it is especially recommended for users doing their first steps with source code management systems. Linux, macOS, and MS Windows are supported.

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