Valve has released a small update for Proton: Proton 6.3-2.

6.3-2:

Fix stuttering mouse cursor issue during longer play sessions.

An free update for the Euro Truck Simulator 2 now adds the new Renault Trucks T & T High: Evolution!

The full announcement can be found here.

An experimental cross-plattform-multiplayer for the theme-park-management-game Parkitect adds the possibility, to play the multiplayer with other platforms than Linux:

Experimental cross-platform multiplayer available

An experimental update for cross-platform multiplayer is now available for testing.
This allows all players to play together, no matter if you're using Windows, macOS or Linux.

Valve has released the next major version of Proton: Proton 6.3.

A manual installation can be forced by doing

steam steam://install/1580130

or via the library in the Steam Client (see Tools section).

Available in Proton 6.3:

6.3-1:

Another huge update (v.13) called "Esparcidor de Estiércol" for Tropico 6 has been released for Linux on Steam:

Update (v.13) 'Esparcidor de Estiércol'

Fellow Tropicans,

Tropico 6 has just received Update 13 – Esparcidor de Estiércol. This update introduces the new ‘Flophouse’ building - providing, well... a roof (at least) for the poor - and the ‘Manure Spreader’, which should help put all that llama poo to good use.

For the free Raytracing-enabled version of the classic shooter Quake 2 the Patch 1.5 has been released for Linux on Steam:

Quake II RTX 1.5 PATCH

Hey, everyone! Today we're releasing v1.5, featuring the below features, fixed issues, and improvements.

New Features:

The Update 32 for the racing simulation Revhead has been released for Linux on Steam.

Date: 26-03-2021
Version: 1.4.7853

Dear Revheads

It is our Birthday Special Days, as you might know, Revhead turned to 4 years old. While our discount is still on for another week long, we are releasing new content as well. This is one of the best time of the year to grab your copy of Revhead!