Thanks for the mention. Am a little surprised they wouldn't list it. I know mmstick at Pop_OS! is aware of it because I mentioned it to him at some point when I felt it had become mature enough. Although it really is not properly packaged into a deb install file just yet, been a bit busy, but also just trying to make heavy use of my own app for my own dev purposes as well without doing daily or weekly development on Kinto at this point. (I have made over 1,000 commits in a 2yr span just on Kinto. Even went from it being written in C to Python.)
I suspect once I package it properly and make it available in various repos and app stores that it will get more coverage. Also Kinto is feature complete as far as I am concerned, only changes that happen now are mostly minor. May do a rewrite of some parts of it to make updates go smoother and allow users to retain their own changes easier but no major functionality changes or additions are planned at this time.