Ul.cfg Ps2 Editor ((free))
Last updated around 2013; can be unstable on Windows 10/11 without compatibility mode.
It was a crude tool, last updated in 2005. No splash screen, no progress bars. Just a stark window with fields for a 32-character title, a disc ID, and a size in megabytes. But to Leo, it was a time machine. ul.cfg ps2 editor