It is 1.9 GB in size: the Update 1.5 of Dungeons 2, a "Dungeon-Master"-like game. It is available now for Linux on Steam.

This Update includes many smaller and big changes. Here is the complete Changelog:

The Steam Stealth Sale with huge discounts on Stealth-games has begun. The sale will last until October 16th.

There are also some good Linux-games offered, for example

- Invisible, Inc
- Outlast
- Masterplan and
- Mark of the Ninja.

The revamped version of Wasteland 2 aka Wasteland 2 Director's Cut is now available on Steam for Linux!

Please remember to read the Known Issues and the FAQ before.

EDIT: It's also available from GOG.

After being three years in Early-Access, today the Version 1.0 of Prison Architect has been released for Linux on Steam.
Besides many Bugfixes there is also now a complete new game-mode, called "Escape-Mode". In this mode the player tries to escape from prisons, which have been built by other players.

The complete list of changes can be read here.

Jotun, a hand-drawn action-exploration game set in Norse mythology, is now available for Linux on Steam.

Description:

Jotun is a hand-drawn action-exploration game set in Norse mythology. In Jotun, you play Thora, a Viking warrior who died an inglorious death and must prove herself to the Gods to enter Valhalla. Impress the Gods!

The current update 5.7 of the Tabletop Simulator not only brings many improvements in details, but also adds a MP3-Player.
Now you can listen to your own songs while playing with your friends.

Grand Ages: Medieval, the newest game from Gaming Minds, is now available for Linux on Steam!

Description:

Rise from the humble role of a simple mayor governing a small settlement and rule over all of Europe.