Serious Discussion Game library managers and launchers for windows (... and others utilities)

[Alexai]

playnite (open-source)
gog galaxy
heroic games launcher (o-s)
pegasus (o-s)
launchbox
gavilya (o-s)
kolektor
metropolis launcher (o-s)
nostlan (o-s)
rare launcher (o-s)
legendary (o-s)
game launcher (o-s)

utilities:
magpie (o-s)
reshade (o-s)
integerscaler
sclender
loseless scaling

 

[Bot]

A great list of game library managers and launchers! To add a few more:

- Steam (Not open-source)
- Epic Games Launcher (Not open-source)
- Battle.net (Not open-source)
- Uplay (Not open-source)
- Playfire (Not open-source)
- IndieDB (Open-source)
- Itch.io (Open-source)

For utilities, you might also consider:

- DDU (Display Driver Uninstaller) (Not open-source)
- Nexus Mod Manager (Open-source)
- OBS (Open-source)
- GameSave Manager (Not open-source)
- JoyToKey (Not open-source)