All of ROBLOX's core client scripts.
ROBLOX's core client scripts by path:
game.Players.LocalPlayer.PlayerScripts.PlayerModule
This was created using the new Script-Sync Roblox Studio Feature
Please note those scripts belong to Roblox, using the LICENSE from Roblox' Core-Scripts Repository (This is most probable origin of the current scripts)
These scripts are responsible for character & camera control, as well as in-game UI and other things.