The following games use VAC:

$0  - Alien Swarm
$10 - Awesomenauts
$20 - Brink
$20 - Call of Duty: Black Ops
$30 - Call of Duty: Black Ops 2
$10 - Call of Duty: Modern Warfare 2#
$20 - Call of Duty: Modern Warfare 3#
$60 - Call of Duty: Ghosts
$25 - Chivalry: Medieval Warfare
$5  - Clickr
$30 - Counter-Strike*
      Counter-Strike: Condition Zero*
      Counter-Strike: Source&
      Counter-Strike: Global Offensive
$7  - Critter Crunch
$10 - Dark Messiah of Might and Magic
$50 - Dark Souls II
$5  - Day of Defeat*
$10 - Day of Defeat: Source&
$30 - DayZ
$20 - Dead Island
$0  - Dota 2
$5  - Deathmatch Classic*
$10 - Dino D-Day
$15 - Dungeon Defenders
$0  - Gotham City Impostors
$10 - Half-Life
$5  - Half-Life 2: Deathmatch&
$10 - Half-Life Deathmatch: Source&
$5  - Half-Life: Opposing Force
$10 - HOARD
$0? - Homefront //not on steam anymore?
$10 - IL-2 Sturmovik: Cliffs of Dover
$15 - Insurgency: Modern Infantry Combat
$10 - Inversion
$20 - Killing Floor
$15 - Krater
$20 - Left 4 Dead
$20 - Left 4 Dead 2
$15 - Lost Planet: Extreme Condition
$10 - Magicka
$10 - Magic: The Gathering – Duels of the Planeswalkers
$10 - Might & Magic: Clash of Heroes
$5  - Monday Night Combat
$0  - Moonbase Alpha
$10 - Mount&Blade: With Fire & Sword
$40 - NASCAR The Game: 2013
$13 - Natural Selection 2
$10 - Nuclear Dawn
$15 - ORION: Dino Horde
$35 - OMSI 2: The Bus Simulator
$15 - Primal Carnage
$10 - R.U.S.E.
$20 - Red Faction: Armageddon
$10 - Red Orchestra: Ostfront 41-45
$10 - Red Orchestra 2: Heroes of Stalingrad
$40 - Resident Evil 6
$50 - Resident Evil: Revelations
$3  - Revelations 2012
$5  - Ricochet*
$10 - Roller Coaster Rampage
$20 - Rust
$10 - Shattered Horizon
$10 - Swords and Soldiers HD
$0  - Team Fortress 2&
$5  - Team Fortress Classic*
$20 - The Ship
$30 - Total War: Shogun 2
$8  - Tower Wars
$0  - War of the Roses
$10 - Wargame: European Escalation
$0  - Zombie Panic: Source&
-
$1000

* Denotes GoldSrc games, if a player is banned in one of these games they are banned from all of them.
& Denotes Source engine games, if a player is banned in one of these games they are banned from all of them.
# Denotes games that have a stricter policy of having all servers VAC protected, and additionally bans players 
  editing of any game files except config files.