Robot models from Unreal Tournament 2004. Compared to the standard ones they look absolutely great; the only downside of these models is their high poly count, which lowers fps, but if you don't need 250 fps and your computer isn't prehistoric, installing these models is highly recommended.
The Unreal Tournament robot models don't replace the standard ones: once you've installed them, you can pick any standard model as your player model, or one of those converted for Half-Life from UT 2004.
The models were converted by Koshak
Installing the models:
Copy the contents into the valve or valve_russian folder
More details on installing models for Half-Life
Download the models: