Day of Defeat: Source
Day of Defeat: Source 17.0 is free to download from our software library. This download was scanned by our built-in antivirus and was rated as virus free. The program belongs to Games. This program is an intellectual property of Valve.
From the developer:
Day of Defeat offers intense online action gameplay set in Europe during WWII.
You may want to check out more software, such as Source Dedicated Server, Source Insight or Lucky Days, which might be similar to Day of Defeat: Source.