yeah, F95Checker, and Tracker and the death of GL is the reason Atlas is being made currently. More open-ended across the board with an open github repo. Got an metadata server that scrapes F95 for us and there is plans to make scraping 100% local aswell obviously. DLSite, Steam and emulator data is also planned to be scrapeable with time after the main client features are in. Just this week they got Banner image downloading working. UI quite custom and open across the board. And its FAST, really damn fast.
We have users that has requested Playnite integration and that might be something to explore down the line. Currently two devs working on Atlas and there is no F95 thread about it yet cause its not ready for the limelight just yet.
Discord and Github is where its at atm which is in my signature.
If you want to test the early builds then join the discord or if you want to keep up with it.
If you know C++ then please take a look at the repo and help out if you want. We also need to make qss style sheets for this and thumbnail presets for mirroring different looks of other clients. You can have the thumb grid look just like F95 or Checker if you want.
EDIT:
Well supporting more metadata sources wouldn't be too complex for Atlas, if you want anything specific to the workflow other than just searching, displaying, installing and playing the titles then that's a different story.
There has been quite a few VN Managers over the years, some real complex but also slow and bloated and many more not functional at all. Most of those also has never been updated in years and years either. Sad state of affairs, atleast Atlas will be pretty much content neutral in the end and anyone can make a metadata scraper for it to pull data from more sources.