But git has always has been, and still is open source. Of course, Fossil has some advantages but claiming the OS high ground shouldn't be one.

OP is obviously editorializing, that isn't the title of the linked document.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):