Surprised to see no mention of Playnite. I used to use Stardock Fences to categorize my games on my desktop, then I found Playnite and there was no looking back. It's a big game library with incredible features. Here's what I see when I load it up. (the games listed here are the games I have listed as "currently playing")
I really, really want to use it instead of having a bunch of launchers for pc and emulation but it's too damn fiddly. Cant get retroachievements to work, normal achievements tab is forever empty, no way I found to have a unified control scheme, most of the plugins I tried do absolutely nothing, like the deal finding one, I could go on.
Not saying it doesn't work, obviously it does. But it doesn't for me sadly. And I can't spend a week on trying to get it to work. Two days of following guides online, did nothing for me, so I just gave up.
I think some plugins rely on having a desktop theme made to accommodate them otherwise you’d have to do the themeing yourself. Thankfully there are plenty that already exist which can be downloaded and applied from within Playnite itself but I do agree that the experience can be a bit of a mess. I really can’t live without it, though. Just completely changed the way I organize and launch games forever.