I would guess that IIS is the only server capable of running .Net applications (unless Mono can do that...?).
But you may be able to run Java web apps on the same machine as IIS (or even in-process with IIS) using something like NewAtlanta ServletExec or Tomcat's JK ISAPI plugin. That would allow some degree of integration.
Ping & DNS - updated with new look and Ping home screen widget