Hello
The robocode repository has been down for quite a while now (
http://robowiki.net/wiki/Talk:RobocodeRepository) but the latest bot archive can be downloaded from the page
http://robowiki.net/wiki/RoboRumble/Starting_With_RoboRumble. Some of the bots in that package have included their source code, and others have not. For the ones that have, you can extract their code using the robocode source editor. Please note that not all of the bots' code are available under the same license, be sure to check out each robots page on the robowiki forinformation on specific code licenses and terms of use for each robot.