For Two Point Hospital a free DLC called "SEGA 60th Items" has been released for Linux on Steam:

SEGA 60th Items

Valve has released another stable Steam-Client (08.10.2020) for Linux:

8 October - Steam Client Update Released

General
Fixed the Steam Client window starting minimized when the client is run after first install on a Windows machine

Library
Improved the alignment of controls in the play bar on game pages

Fixed one instance where achievement unlock percentage was not shown on game pages

Added Edit Review button to personal review on game pages

On GOG the 12th anniversary sale has begun.

It will go on until 09.10.2020.

A new free DLC available on Steam for the American Truck Simulator adds a new truck to the game: the " Western Star 49X ".

Another huge update (v.11) called "La Misteriosa Palmera" for Tropico 6 has been released for Linux on Steam:

Fellow Tropicans,

A free new update for Tropico 6 is now available.

Packed with improvements, the ‘La Misteriosa Palmera‘ Update brings with it 4 new sandbox maps as well as balancing changes and various bug fixes!

You can find the full list of tweaks and improvements below:

The DLC Hellraid for the Zombie-game Dying Light has received it's first big update: Lord Hector's Demise.

Dying Light - Hellraid: Lord Hector's Demise

Dear Hellraid adventurers,

The Update 29 for the racing simulation Revhead has been released for Linux on Steam.

Date: 25-09-2020
Version: 1.4.7167

Dear Revheads!