EDIT
To put this list in perspective I actually own the following consoles and have the following clients installed on my PC:
Atari 2600
Atari 5200
Atari 7800
Nintendo Entertainment System (NES)
Sega Genesis
Super Nintendo Entertainment System (SNES)
Sony Playstation (PS1)
Nintendo 64 (N64)
Sega Dreamcast (DC)
Sony Playstation 2 (PS2)
Nintendo Gamecube (GC)
Microsoft Xbox (Xbox original)
Microsoft Xbox 360 (X360)
Microsoft Xbox One (XBO)
Nintendo Gameboy (original phat version)
Sega Game Gear (GG)
Nintendo Virtual Boy
Nintendo Game Boy Advance (GBA)
Nintendo DS (DS)
Sony Playstation Portable (PSP)
BattleNet Launcher (Blizzard Entertainment)
Epic Games Launcher (Unreal Dev)
Origin (EADM / EA)
Uplay (Ubisoft)
Glyph Client (Trion Worlds)
Windows 10 Store / Xbox (Xbox Play Anyhwhere)
Stardock / Gamestop App
GOG Galaxy
Desura / One Play
Other Devices in my house that I can play on:
Sony Playstation 3 (PS3)
Sony Playstation 4 (PS4)
Sony Playstation Portable Vita (VITA)
OUYA <no longer here>
Nintendo Wii <no longer here>
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Steam and Battle.net (Overwatch) :)
Sometimes AC Syndicate, The Division and Far Cry Primal on uPlay.
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