What does HackerNews think of Installer?
A Windows 11 modification to make Windows more consistent.
Language:
C#
Looks like it's open source: https://github.com/Rectify11/Installer
Says so on the FAQs page of the (terrible) website as well.
How is it closed source? The source code is literally on github: https://github.com/Rectify11/Installer
I've been in their Discord server for a while, so feel free to ask any questions. They used to have Rectify11 and several other Windows mods in one server, but Rectify11 has since been changed to a Rectify11-specific server[1], and the then-current server was renamed to the Windows Mod Hub[2], which I'd also recommend checking out.
[1]: https://discord.gg/sDRcjjaS5a
[2]: https://discord.gg/sDRcjjaS5a
Edit: yes, the site does a very poor job of explaining what it does. I'm not gonna make excuses for them, but here's what it does: it combines a bunch of other software, stuff like ExplorerPatcher, and adds some more on top, to "rectify" Windows 11 to be more consistent, and overall a better experience.
The source code is available here: https://github.com/Rectify11/Installer