While we already have ProtonUp-Qt which works just fine, it seems another thought they could do it better and differently with Proton version manager ProtonPlus. For those of your on GNOME desktops, you might like this one more eventually when it's more developed, since it's using GTK.
It's early days yet, with nothing pre-built and a lack of build instructions but it seems like they have a nice idea for it. To help you manage Proton for Steam, Lutris, Heroic Games Launcher and Bottles.
I'll be keeping an eye on it.