Name of the software : brave browser 0.55.22
Project website : www.brave.com
This is the new version of Brave. Currently the version present in the stable repository of Solus is version 0.27.79 based on Muon, brave has abandoned his browser based on Muon and replaced it with a new version based on chromium, the version present in the repository of Solus is therefore obsolete.
Is it open source ? Yes, it's under Mozilla Public License 2.0 https://github.com/brave/brave-browser/blob/master/LICENSE
New repository : https://github.com/brave/brave-browser