Here is a list of all the DLC giveaways from around the internet.

• {LINK REMOVED}Magicka: Wizard Wars Razerized in-game items
  
• {LINK REMOVED}Dying Light in-game Razer T-Shirt
  
• {LINK REMOVED}Dying Light in-game Alienware T-Shirt
  
• {LINK REMOVED}Royal Quest-Welcome Pack
  
• {LINK REMOVED}Double-Take: The Designer's Cut
  
• {LINK REMOVED}Payday 2 Alienware Alpha Mauler
  
• {LINK REMOVED}Arena: Cyber Evolution Item Bundle

Please note that free DLCs available on the Steam Store are not listed here. However if the group members want then I can post them.