Left 4 Dead 2 - Valve
Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Left 4 Dead 2
  • Fixed lobbies not being able to join Steam Group servers
Garry's Mod - Valve
Updates to Garry's Mod have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Garry's Mod
  • Fixed dropdowns and menus not showing on menu screen
  • Fixed FOV getting locked
  • Toybox content downloading retries 3 times before failing
  • Changed the way toybox authentication works
  • [TTT] Added Decoy equipment for Traitors.
  • [TTT] Added credit transferring for Traitors and Detectives.
  • [TTT] Changed C4 disarming to involve wire cutting rather than codes.
  • [TTT] Changed Traitor starting credits to 2.
  • [TTT] Changed balance on most Traitor equipment to make it less noisy and more powerful
Patrician IV - Valve
Updates to Patrician IV have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Patrician IV 1.2

Missions
  • Harbours in an entire region are now besieged by the local sovereign
  • Two new events for the Elderman to react to: Harbour siege and bad food supply
  • New town hall mission: City seeks help after a desastrous event
  • Two new guild missions: Supply food, hunt down pirates in a region
  • New tavern missions: Hunt down pirate, provoke uprising, transport evacuees
  • Revised some missions
Gameplay
  • Plagues now cause fatalities on advanced difficulty settings
  • Treasuries of AI-controlled cities increase more slowly (AI construction slowed down)
  • Buildings under construction by the player can now be canceled
  • Reduced volume of money jingle and added options.cfg setting
  • Underproduction of goods in a city is now displayed in the trade window of the market hall
  • Fire event revised and new event video added
  • Revised display of guild options
  • Revised construction and layout of streets
  • Decreased duration of sieges
Sea battles
  • Matched camera zoom levels with cannon ranges
  • Player-controlled vessels now stick to their last command until a new one is issued
  • Revised gunfire sound and line of fire
  • Wind speed and direction is now displayed by moving clouds
Interface
  • If a trade convoy is being attacked, a battle icon with tooltip is being displayed for two days on the sea map
  • In construction mode, buildings under construction are now indicated with a tooltip
  • The currently selected convoy is now marked in the convoy list
  • The convoy options window can now be accessed from the convoy list
  • Transferring goods between convoys is now possible by selecting a convoy and right-clicking on the target convoy
  • The convoy list now displays single, unorganized ships
  • Tooltips for the counting house administrator now display the production price of goods
  • Amount of goods for auto trade routes can now be adjusted in +/
  • 10 percent steps
  • Revised keyboard shortcuts and added a new options dialogue in pause menu
  • Convoys can now be saved on number keys (1...0)
  • Added new video events for rank promotion
Info displays
  • City info: Current amount of beggars and influx of beggars is now displayed
  • City info: If living space for individual types of citizens is filled by 90% or more, the amount of tenants is displayed
  • Negative values for city reputation is now displayed instead of 0%
  • Effects of fountains, hospital and chapel are now displayed
Bugfixes
  • Resolved issues with administrator and trade routes due to rounding errors
  • Revised city promotion
  • Fixed some rare crashes
  • Fixed AI building construction outside city walls
  • Fixed issues with sieging player convoys
  • Fixed issues with town discovery and city founding
  • Fixed issues with high desktop resolution (DPI) settings in Windows
  • Improved support for USB sound devices (e.g. Logitech G35)
Product Update - Valve
Updates to Serious Sam HD: The Second Encounter have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
  • Serious Editor (beta version) is now available for installation from the Steam's "Tools" tab.
  • The game can now be started in the new "moddable" mode. It allows custom user-generated content (maps, player models, sound packs, etc), to be loaded.
  • Fixed some possible exploits on the Green Field survival level.
  • Fixed boosting of network priorities for enemies that the player is aiming at.
  • Recently aimed entities are no longer processed for player which plays on the server.

Disciples II: Rise of the Elves - Valve
Left 4 Dead 2 - Valve
Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Left 4 Dead 2
  • Fixed the fix of the fix of the fix of the door exploit in No Mercy
Mafia II (Classic) - Valve
Updates to Mafia II have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
  • Achievement Support for Joe’s Adventure
  • Additional Leaderboard support for Joe’s Adventure
  • Fix to Chapter 14 problem
Team Fortress 2 - Valve
Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Team Fortress 2
  • Fixed another sentry gun exploit that let Engineers build multiple sentries
  • Fixed Engineers being able to build level 3 mini-sentries using The Wrangler for real this time
The Polynomial - Space of the music - Valve
Updates to The Polynomial have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
  • Leaderboards update frequency reduced to minimize server load.
  • Controller fixes (can set controller speed now with same slider as for mouse, and controller also works when in traditional shooter mode).
  • Can disable crosshair by pressing H one more time.
  • Crosshair drawing moved to Lua for user modifiability.
Power of Defense - Valve
Updates to Power of Defense have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Power of Defense
  • Balance renewed
  • New levels with double bridges and traps
  • Multiplayer improved
  • Highscores improved
  • GUI improved
  • Localization improved
  • Performance improved
  • Bugfixes
  • New Achievements
...