Well, i would like to introduce you Playnite, a great tool IMO.
There's a lot of stores with their own launcher : Steam, Origin, UPlay, Twitch etc... and older games with just an install shortcut.
Im not related to this project, i was looking for this kind of tool, 'cos most of my games are on Steam, so most of the time i dont launch other launchers and i simply forget about the games i have on other stores.
And Steam also annoys me cos it deletes regularly and without my consent all my categories.
And so, i'm pretty amazed by this tool: from an unified interface, you can launch / categorize for all of your games. You can also customize the page of each game (title / icon / background / description / genre / tags etc ...) and/or download these informations from stores or online DB, there's also an advanced filter etc...
You should really check this tool
Link : https://playnite.link
Official screenshot :
My Sports Library :