Source: Azzkiker from HL2Files.com via mail

Want some fun in Half-Life 2? Well then maybe this mod is something for you. The BulletTime mod adds well bullettime to Half-Life 2:

Here's a tiny simple script for hl2, which makes the game go "bullet-time" when pressing "b" button and while in bullet-time the physics and ragdolls fly a lot further than in normal mode. Due to no physics on bullets except crossbow, grenades, rpg and bugbait, the other weapons' bullets wont slow down.

Think of it as "The Matrix" ... or ... "Max Payne" in Half-Life 2!

Full installation instructions included in the ReadMe file.

Enjoy!

You can get the mod here at HL2Files.com.