GOverlay is great! Giving you a real easy way to tweak the MangoHud performance overlay on Linux, along with it also working with vkBasalt and ReplaySorcery.
ProtonUp-Qt, the very useful installer app to get different compatibility layers on Steam Deck and Linux desktop, has version 2.7.7 up adding in new tools.
Recently, Epic Games rolled out a change to their account system aimed at protecting the younger people on their store and it has caused issues for the Heroic Games Launcher.
In the latest Steam Client Beta for Desktop released December 13th, Valve has now fixed the New Big Picture Mode not working for those with NVIDIA GPUs along with plenty of other fixes.
The Heroic Games Launcher to help manage games on Steam Deck and Linux with GOG, Epic Games and other apps you can sideload has a new release out to clean up after the recent big update.
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.
OpenRGB is a stellar open source project that aims to allow you to deal with all the various RGB lights your hardware comes with, as most vendors don't have apps for Linux.
While Valve continues working towards replacing the old Big Picture Mode with the UI from the Steam Deck, a few more fixes are in the new Steam Client Beta.