In the ever-continued absence of Half Life 3, the Half Life 2 modding community continues to be hard at work filling that void. Bringing everything from the disaster Hunt Down The Freeman to the Valve-endorsed Black Mesa. But picture everything Hunt Down The Freeman failed at: Dark protagonist, new weapons, vehicles, characters, and mechanics, done right.
The Combine are recruiting!
(Notably unlike Black Mesa, completely free with owning Half-Life 2, so maybe Portal Stories: Mel is a better comparison)