Caliber Online

Play Caliber Online With Friends
It's easy. Here's how:

Download VASSAL-
Click Here

Then download Caliber Online-
Click Here

Install VASSAL. When you have VASSAL ready to use, run it.
You should see a window where you can click FILE -> OPEN MODULE
Extract the contents of the Caliber ZIP file. Then, Select the Caliber module and you're ready to play.