What game soundtracks can you get for free?

[McFlurry Butts]

Either by the official website or from the game directly.

Here's my list.

• Eye.(Might be in game files too) http://eye.streumon-studio.com/index.php?page=music
  
• NeoTokyo.(On Steam/game files.)
  
• System Shock 2 (In game files)

[Dono Kill TF2]

Buying both Super Smash Bros for Wii U and 3DS will get you a "free" soundtrack.

[armedready]

Hammerwatch includes MP3 & FLAC http://steamcommunity.com/app/239070/discussions/0/810938082004315395/

Cave Story http://www.cavestory.org/download/music.php

[Midnight Sky ✨🌙✨]

Star Wars: Republic Commando's was availble for free until the site hosting it was taken down.

Infamous: Second Son's is availble for free from PSN.

Darksiders' comes with the game, it's not in the game's files though.

[Fork_Q2]

Portal 2:
http://www.thinkwithportals.com/music.php

You can download most Valve games soundtrack (for free), once the game is in your library.

[armedready]

lume
http://www.lumegame.com/