Sturmbot 1.7b 11b is the latest package for Steam Day of Defeat 1.3.
Warning this package is a manual install and difficult.
Easy, automatic install for Sturmbot 1.7b the latest steampipe dod steam 1.3... Simple!
Comes with many extras, the best way to install Sturmbot 17b.
This download was the only Source code I know of. I think it came from the Bot United forums a long time ago.
From the readme... "Sturmbot 1.6 is a "bot" plugin for the Half-Life mod, Day of Defeat version 1.0 or greater (called DOD from now on)." Use this for the latest steam dod version 1.3 SteamPipe.