Yes it's still being developed. You are right there was a slowdown. I recently had twins and was on parental leave then back to work. So I'm getting back into the swing of things. I have a laundry list of items I plan to tackle with the long weekend in the US.
We don't really want to do that because it's impossible for us to keep it up to date. Instead we're going a browser redirection route using app deep links with a tool called:
Woah nice find. This is outta control. I think our new infinite scroll library will make this better. That should be in the next release and I'll personally keep a close eye on this. Pretty wild. Thanks for reporting!
I use lidarr in combination with these scripts for downloading.
https://github.com/RandomNinjaAtk/arr-scripts
Really nice set up, add music you want in lidarr and it just magically appears for you.
For front end I use plexamp like others have mentioned