You could just run it under an emulator on your PC/Mac/whatever. I've never seen any official ports of it to anything but I could be wrong. There was a user run project to implement it with the Unreal engine but it seems to have died as the latest update to the site was in January this year.
One of my friends did a Herzog Zwei clone called
Bapple 2 but he never finished it. Runs under DOS and Windows and it does have network capability. The source code is available so you could update it and finish it off if you had the time.
- Trevor