I tried Qute in the early, early days, then happened to sit in on a CCC lightning talk (completely coincidental) a few days later where the creator spoke about it. I really liked the concept but it wasn't quite there yet, and I didn't have the means (time, skill) to help.

Checking, it still doesn't seem to be in the Debian Stretch repositories (which is a major indicator of maturity and support to me). Is the project active or is it still a hobby project from one core developer?

There are recent releases but it's hard to tell how significant releases are when almost every change log line is something like "New :debug-log-filter command".