This is the SCP: Overlord (Demos & B-sides) soundtracks individually uploaded to Soundcloud since other individual uploads I couldn't find at the time. You can find the entire (uncut) Demos & B-sides album here: https://www.youtube.com/watch?v=RcAGiS3_sPg 

Credits: Afterinfinity Music (https://soundcloud.com/afterinfinity-music)

SCP OVERLORD: Commune

The Imperial Guard Warhammer 40K

Turbo Overkill (Selections from the Original Game Soundtrack)

SYNfrontation

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War Thunder - Menu Music 4

flowing 10 bpm august 10 take 1

DARK AMBIENT SOUNDSCAPES FOR YOUR PLEASURE

DARK AMBIENT - ATHENAS SHRINE

EZ Water Lattice Formation

Command & Conquer 3 Tiberium Wars - Apocalypse (music)

End of the Tour

Zero Point Energy

Soundtrack from the game Company Of Heroes 2.

SCP OVERLORD: Commune

Gingiraccoon