Sourceforts

This game has a 19.2 MB trailer available for download.
Download it in High Definition with Steam, or visit its web page to stream it.

SourceForts is a fast-paced, yet strategically challenging Source mod. Two teams build a base for their flag, and barrage the opposing team in order to capture the flag and protect their own.

Screenshots: [1] [2] [3] [4] [5] [6]

Official website

ModDB page