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

SEGA 60th Items

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

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 Byzantium & Gaul Pack for Civilization VI is now available for Linux on Steam!

Note: there seems to be currently a bug regarding the activation (not only on Linux).

The new (paid) DLC Hellraid for the Zombie-game Dying Light snatches the player into another realm and is now available for Linux on Steam.

Another (paid) DLC called "Ethopia Pack" for Civilization VI is now available for Linux on Steam!

Civilization VI - Ethiopia Pack Available Now
We’re excited to announce the Ethiopia Pack is available now, as part of the New Frontier Pass or as an individual $4.99 purchase.

23 Jul, 2020

The new (paid) DLC called "Idaho" for the American Truck Simulator is now available for Linux on Steam!

Welcome to Idaho, a land of rugged beauty that is home to millions of acres of wilderness and a landscape that ranges from desert to fertile farms. Best known for its world famous potatoes, Idaho offers drivers the opportunity to get involved with some of the States' largest economies such as farming and timber harvesting.