LÖVE

I found myself with a lot of un-played games in my library so I made this, essentially all it does is go through all the names of the folders in your steamapps' common directory. So it's a glorified randomizer, I will be adding to it and updating the UI over time. You can add groups, like First person shooter, yet to play, favorite, etc. I'm planning on adding a text file importer.

Also, if anyone knows how to go through the names of the games in a person's library and not just those that are downloaded, launch games from the randomizer, and other improvements, I would love to hear it.

GitHub/Source Code: https://github.com/Baggef/SteamRandomizer

You can use the steam:// [1] uri protocol to do lots of stuff in steam. In your case you will want to use steam://launch/appid.
I'm not sure about the capabilites of löve in terms of third party http requests, but if you're able to use the steam rest api you can check out the GetOwnedGames [2] method (requires relatively lax steam privacy settings from the user).

[1] https://developer.valvesoftware.com/wik ... r_protocol
[2] https://developer.valvesoftware.com/wik ... 28v0001.29

This seems to be geared towards Windows, the Game Directory it is scanning doesn't exist on Linux.

You could rewrite this by using my humble Steamworks FFI binding (see the ISteamApp interface):
https://love2d.org/forums/viewtopic.php?f=5&t=87917
But that would require platform-specific binaries (provided by Valve) plus the Steam client installed and running.