...that you can legally download from official websites, blog, forums etc.

Number :
40 Stories

A
AION
AION - The Tower of Eternity
Alchemia
Al Emmo and the lost dutchman's mine
Alfred chicken
Alone in the dark 4
Alpha prime
Amiga compilation
Angry Birds
Arcane online
Arcanum
Atlantica online
Auto Assault

B
Baldur's gate (weird remixes)
Banjo-Kazooie : nuts & bolts
Battleforge (3 songs)
Battle rage (3 songs)
Besieger
Beyond divinity
Big brain wolf
Bioshock
Blast off
Bully

C
Call of Cthulhu
Captive 2 : liberation
Castle Crashers
Cave story
Clive Barker's undying
Cloud
Colony wars
Company of heroes (all heroes rise)
Company of heroes (songs from the front)
Crayon physics deluxe
Crazy Ivan
Cthulhu Saves the World
Cultures 2
Cyberspeed

D
Dawn of war 2
Day of the tentacle
Deathspank
Descent 3
Deus Ex : invisible war
Divine divinity
Doom
Doom 2
Duke Nukem : total meltdown
Dungeon keeper 2
Dungeons & Dragons online

E
Earthrise
Elven legacy (2 songs)
[url=http://www.fileplanet.com/112583/110000/fileinfo/Emperor:-Rise-of-the-Middle-Kingdom-Soundtrack]Emperor: Rise of the Middle Kingdom[/url]
Escape from monkey island
E.V.E online
Evochron Mercenary

F
Fallout 1 & 2
Flock !

G
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=92:gabriel-knight-sound-blaster-gm&catid=54:gabrial-knight&Itemid=92]Gabriel knight[/url]
Global Crisis
God of War Trilogy
Goldeneye 007
Gothic 2
Gothic 3 (2 songs)
Greed
Grid
Grim Fandango
Ground control

H
Henry Hatsworth
Hitman (3 songs)

I
Immortal cities : children of the Nile
Indiana Jones and the staff of kings
Inquisitor
Invincible tiger

J
Jets 'n' Guns

K
King's bounty : the legend
King's bounty : armored princess
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=110:kings-quest-1-sound-blaster-gm&catid=47:kings-quest-1&Itemid=87]King's quest 1[/url]
King's quest 2
King's quest 3 (remake)
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=117:kings-quest-4-sound-blaster-gm&catid=71:kings-quest-4&Itemid=87]King's quest 4[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=121:kings-quest-5-digital&catid=72:kings-quest-5&Itemid=87]King's quest 5[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=130:kings-quest-6-digital-ogg&catid=73:kings-quest-6&Itemid=87]King's quest 6 CD1[/url] & [url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=237:kings-quest-6-digital-ogg&catid=73:kings-quest-6&Itemid=87]CD2[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=139:kings-quest-7-sound-blaster-gm&catid=74:kings-quest-7&Itemid=87]King's quest 7[/url]

L
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=143:leisure-suit-larry-1-sound-blaster&catid=76:leisure-suit-larry-1&Itemid=132]Leisure suit Larry 1[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=category&id=93:leisure-suit-larry-2&Itemid=132&layout=default]Leisure suit Larry 2[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=153:leisure-suit-larry-3-digital&catid=94:leisure-suit-larry-3&Itemid=132]Leisure suit Larry 3[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=156:leisure-suit-larry-5-sound-blaster-gm&catid=95:leisure-suit-larry-5&Itemid=132]Leisure suit Larry 5[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=162:leisure-suit-larry-6-digital&catid=96:leisure-suit-larry-6&Itemid=132]Leisure suit Larry 6[/url]
Leisure suit Larry 7
Lineage 2

M
Machinarium
Men of Valor
[url=http://www.fileplanet.com/135381/130000/fileinfo/Metal-Arms:-Glitch-in-the-System-Soundtrack]Metal Arms: Glitch in the System[/url]
Minecraft
[url=http://www.fileplanet.com/80877/80000/fileinfo/Myth-III:-The-Wolf-Age-Sound-Track-Music]Myth III: The Wolf Age[/url]

N
Neocron

Hmmmm I've seen the Grim Fandango soundtrack floating around....

O
Obscure
Obscure 2
One must fall : battleground
Operation flashpoint : dragon rising (300 Mo .wav)
Original war
Outcast
Outlaws
Overgrowth


P
Panel de pon
Panzer general
Perimeter
Pirates of New Horizons
Poker smash
Populous
Purge Jihad


Q


R
Radical Dreamers - Thieves of Fate Remix
[url=http://www.fileplanet.com/147568/140000/fileinfo/Red-Orchestra-Sound-Track ]Red orchestra[/url]
Return to castle Wolfenstein
Risen (2 songs)
Rocket Arena 3
Ryzom


S
Sadness
Sam & Max hit the road
Saqqarah
Scrapland
Shadowgrounds
Shank
Shattered horizon
Sin Remix
Small worlds
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=213:space-quest-1-digital&catid=87:space-quest-1&Itemid=162]Space quest 1[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=217:space-quest-3-digital&catid=88:space-quest-3&Itemid=162]Space quest 3[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=223:space-quest-4-digital&catid=89:space-quest-4&Itemid=162]Space quest 4[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=227:space-quest-5-digital&catid=90:space-quest-5&Itemid=162]Space quest 5[/url]
[url=http://queststudios.com/Joomla/index.php?option=com_content&view=article&id=231:space-quest-6-digital&catid=91:space-quest-6&Itemid=162]Space quest 6[/url]
Space war commander
Spellforce
Splinter cell : double agent
Split/Second
Splosion man
S.T.A.L.K.E.R shadow of Chernobyl (plus fan-musics)
Stargunner
Supersonic racers
Super Street Fighter II Turbo Remix
System shock 2


T
The bard's tale
The Chronicles of Riddick
The curse of monkey island
The dig
[url=http://www.fileplanet.com/163852/160000/fileinfo/Elder-Scrolls-IV:-Oblivion---All-Original-Music-Score]The Elder Scrolls IV: Oblivion[/url]
The fall - last days of Gaia (3 songs)
The incredible Hulk : ultimate destruction
The longest journey
The Lord of the Rings Online
The secret of monkey island
The secret of monkey island 2
The Witcher
Thief 1&2
Time Crisis 4
Timeline
Toki Tori
Tomb raider collection
[url=http://www.fileplanet.com/200545/200000/fileinfo/Tomb-Raider:-Underworld-Soundtrack-(Deluxe-Edition)]Tomb Raider: Underworld[/url]
Tom Clancy's : ghost recon
Tom Clancy's : ghost recon - island thunder
Tom Clancy's : rainbow six
Tom Clancy's rainbow six 3 : raven shield
Tom Clancy's : the sum of all fears
Trespasser : the lost world
Trine (main theme)


U
Ultima 5
Universe at war
Unreal II Remix


V

Vangers


W
Warhammer : dark omen
Warhammer online
Wipeout (PS1)
Wipeout 2097
World of Goo


X
XIII century (3 songs)


Y


Z
Zak McKraken (2 songs)
ZanZarah : the hidden portal
Zeno Clash
Zombie driver
Zoo empire



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Movie soundtracks :

Elephants dream

I think you can download the OFP2:Dragon Rising soundtrack from Codemasters site

Dawn of War II
http://store.steampowered.com/app/15620/ (Scroll down a bit)
Universe at War: Earth Assault
http://www.petroglyphgames.com/forums/index.php?showtopic=7587
There are others that I'm forgetting at the moment.

http://www.tombraiderchronicles.com/soundtrack/index.html
Tomb Raider. Every last one of them.
Techncially its not the officiial site but tomb raider chronicles is permitted to host them

Thx guys. Bed time now.

Cool, a thread I can actually contribute to!
Bioshock
It's way down near the bottom of the page.

A while back FilePlanet featured the soundtracks for Riddick, The Witcher and various other games (part 1, part 2).

Very nice, thanks for the thread!
I'll post whatever (if) I can find.

Apogee Software's Stargunner.

Good old LucasArts soundtracks with incredible covers!
Not an official site here, but tolerated by LucasArts, as they have already asked them to not distribute Star Wars and Indiana Jones soundtracks but haven't said a word about the others.
Nice list by the way ;)

I knew the LucasArts soundtracks page but I wasn't sure if it was official or not, and it seems that it's tolerated indeed and the author removes soundtracks on LucasArts demand. Good one btw, thx !
I'm trying to collect The Chronicles of Riddick soundtracks but their website is a pain in the butt...
Thx guys !