So I have a few keys to give...

EDIT 3: I just checked and all keys were already taken! Thanks to everyone who joined in my cake day (without me noticing it's my cake day '-') and sorry to everyone who didn't get a key "/

I don't know which ones I've already used, so here goes all of them (all from bundles)

1.Mount & Blade - DeathPro
2.Majesty 2 Collection - konjaks
3.Hoard Complete Pack - isador555
4.Forge Starter Pack - longbottom45
5.Crusader Kings Complete - SpirescuAndrei
6.Shelter - TheLuckyShamrock
7.Enclave - heilurmes
8.Rune Classic - DeadKanekiNote
9.Knights & Merchants - dxcnation37

10.Tropico 4 Steam Special Edition - vampiremanstm
11.Stealth Bastard Deluxe - ambidot? > cucooo
12.Dungeonbowl - EndlessHorizon
13.Port Royale 3 - aztech
14.King's Bounty: Legions True Tactician Ultimate Pack - kisshun
15.Iron Sky: Invasion - Skibby
16.Day One: Garry's Incident - slicer1230
17.Steel Storm: Complete Edition - NinosAksel
18.Naval Warfare - OldManAtari
19.Earth 2150 Trilogy - Caractacus

20.GTR Evolution - Flasheriso
21.Dark Sector - Lugum
22.Cannon Fodder 3 - x4mer
23.Septerra Core: Legacy of the Creator - Kiyana
24.Space Pirates and Zombies - Franciszek
25.1953 KGB Unleashed - Rachelsfg
26.Guardians of Graxia + Map Pack DLC - JustinSane059
27.Guardians of Graxis: Elves & Dwarves DLC
28.GTR Evolution (may not work)
29.Dark Sector - Lugum (In case the other doesn't work, if it does, sein77)
30.Cannon Fodder 3 - Udeadman
31.Septerra Core: Legacy of the Creator - Ragecry (20 min ago)
32.Space Pirates and Zombies - dreadfulpennyarcade
33.1953 KGB Unleashed - SuperKiller2
34.Guardians of Graxia + Map Pack DLC - moshimoshi
35.Guardians of Graxis: Elves & Dwarves DLC

36.Tropico 3: Steam Special Edition - TLLP
37.Earth 2160 - DanZDK
38.Patrician IV - Steam Special Edition - hlex1
39.Jagged Alliance 2 - Wildfire - sweetcuppincakes
40.Restaurant Empire 2 - Kataclysm

44.Section 8 - PeteOzzy
45.The First Templar Steam Special Edition - DetreS
46.Legendary - combatbeard
47.Dream Pinball 3D - nsm0220
48.Disciples III: Ressurection - oblueknighto
49.Insecticide - kmax16
50.Tropico Trilogy - fckmylife
51.Imperium Romanum: Gold Edition - Kaijuzilla
52.SpaceChem - usx18
53.Dino D-Day - binetudanji

I didn't put the keys here because I want to give these keys to as many people as possible, so post here the key you want and I'll send it to you, just one per person!

Also, I can't garantee all of them will work, sadly "/

I'll put your names here and will begin to send them in some minutes

EDIT: I updated the list of keys asked till NinosAksel post. I'll continue to read the replies and after I check if I was fair to everyone that asked keys, I'll start sending them, just wait a little ")

EDIT2: It seems it's really my cake day and I didn't even knew it! Also, got the names, now I'll check the replies again...