Another version (0.5.9) of Lutris has been released:

lutris (0.5.9)

The new version 2021.10.11 of AppGameKit Classic (aka AGK2) is now available for Linux on Steam.

The changelog to the current version:

AppGameKit Classic 2021.10.11 update released!

Another new stable Steam-Client 07.10.2021 has been released for Linux. It contains an improved Vulkan-Shader-caching among other things:

Steam Client Update, October 7

A new Steam client has been released and will be automatically downloaded.

General

When Steam detects a game file has been corrupted, it will now try to reuse as much of the corrupted file as possible to save bandwidth when downloading correct data for that file
Fix bug causing slow reconnect to Steam after resuming from a system suspend

Valve has released another update for Proton: Proton 6.3-7.

6.3-7:

RetroArch, the universal emulation-frontend/framework, migrates it's Linux-version on Steam from AppImage to Soldier Runtime:

Hello everyone!

For the American Truck Simulator and the Euro Truck Simulator 2 a new (paid) DLC is now available for Linux on Steam: the "Volvo Construction Equipment".

The Volvo Construction Equipment DLC includes 5 different branded construction machinery from Volvo CE's line-up for drivers to haul and deliver across the USA.

The Version 2021.09.20 of the (game-)development-tool AppGameKit Studio is now available for Linux on Steam.

AppGameKit Studio 2021.09.20 update released!

Welcome to the September update for AppGameKit Studio. This new version brings support for Android bundles to ensure apps comply with the Google Play store rules and regulations. The full list of changes are listed here:

iOS