-
PolyMC
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
-
GDLauncher
GDLauncher is a simple, yet powerful Minecraft custom launcher with a strong focus on the user experience
-
SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Try using polyMC (also in the AUR: polymc or polymc-bin), its an open source minecraft launcher and should work better than the normal minecraft launcher
It's buggy on KDE plasma. It will open if you open minecraft-launcher from a terminal, or even execute the .desktop file from a terminal. I use GD Launcher as it can sync mods (and modpacks) with curseforge and it's can update mods and releases for you.