Alien Swarm Deferred

Alien Swarm Deferred was released in 2012. It's a third-party mod created by Kristjan Skutta a.k.a. Biohazard90. This fork of Alien Swarm has support for deferred lighting and shadows (similar to Black Mesa). It's among very few Source games that have dynamic shadows not based on projected textures, while still having its source code available to the public. Performance-wise, it is extremely impressive as the mod can support hundreds of dynamic shadows with very little performance impact.

Features

New since Alien Swarm:

CSM: Real time shadows and lighting from Light environment, Light, Projected texture, and Point spotlight entities.
Blinn–Phong reflection model: New reflections on Phong materials.
Volumetric lighting: Deferred lights are capable of enabling volumetrics that react to the environment in realtime.
Source shader editor: Make and edit shader graphs in real-time, in-engine.
Light editor: Edit your map's light entities dynamically.

Media

Phong reflections

Volumetric lights and god rays

Realtime shadows

Availability

2014 Lambda Wars
TBA Director's Cut (Initially. Switched to Source 2013)
TBA Portal 2: Desolation
Confirm:Some elements can be clearly seen in prerelease footage like the Light Editor, so its definietly uses some code from ASD