Nexus Mods improve the new open source app with UI upgrades, Cyberpunk 2077 fixes and more
(www.gamingonlinux.com)
Not there yet. It is still very early in alpha developement and only supports a few games (iirc Stardew Valley, Cyberpunk 2077, Baldurs Gate 3).
Supposedly it should be better than MO2 when it's finished though.