If you start Cossacks 3 while Halloween, you might get some surprises.

Special graphics and maps in Halloween-Design change the look of the game until 01.11.2017 (19:00 CET):

Dear friends!

Once upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore
While I nodded, nearly napping, suddenly there came a tapping,
Halloween discounts rapping, rapping at my chamber door.

For the realtime-tactic-game Sudden Strike 4 the DLC Road to Dunkirk has been released for Linux on GOG and Steam.

It adds two new campaigns and many new units to the game:

FEATURE LIST

The developers of Mushroom Wars 2 just communicated in the Steam-forum that today will see the release of the Linux-Version of this RTS-game on Steam!

UPDATE: the game is now available for Linux!

Key Features:

OpenRA, the free implementation of RTS classic games C&C (Tiberian Dawn), C&C: Red Alert, and Dune 2000, has just published a new release after three month of public playtesting.

It contains fundamental changes to the mod-support (now with an own SDK), a new UI with a Commandbar and much more:

The successful game series enters the next round: Dungeons 3 is the long awaited sequel to the predecessor from 2015 and is now available for Linux on GOG and Steam!

Description:

FEATURE LIST

The 1.5 GB huge Patch 1.04 for Sudden Strike 4 has been released for für Linux on Steam.

It contains among other things two new, large multiplayer maps:

Sudden Strike 4 v1.04 Changelog

2 new, large multiplayer map
Large map support fixes
Chinese voice fixes
Modding feature supports
Classic mode countdown fixes
Classic mode UI fixes
Formation UI fix

For Tower of Time, the mixture of RPG and RTS with tactical combat, the 1.2 GB big Build 0.5.1.559 for Linux has been released on Steam.

With this patch the game gets a complete overhaul of graphics, a new UI and many more improvements:

Patch Notes Build: 0.5.1.559

Tower of Time is now different look and feel.