Debug Menu
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The Debug Menu are present (in all games since 
Source 2007) except in 
Counter-Strike: Global Offensive.
It can be shown by pressing Shift + F1 or by typing "debugsystemui" in the Console.
Warning:Enabling certain options like MatSys > Software Lighting can cause the game to crash.
Note:Some games may not include the scripts/debugoptions.txt which cause the Debug Menu UI to be broken, copy it from any other Source game (example: 
Half-Life 2) and paste it into the same directory on a game that have the broken Debug UI.Contains a few debugging options that run commands in the console.
The file is located here: 
scripts/debugoptions.txt and can be modified.