You may download them from https://sourceforge.net/projects/perkun/ and https://sourceforge.net/projects/perkun2/.
In Perkun there are no substantial changes, just a couple new getters. In Perkun2 there is:
- an extra parameter (agent name) passed to the print_prompt sub in Perl
- enhanced code to interpret the actions
- modified procedure loop
I am currently trying to implement something similar to https://sourceforge.net/projects/perkunwars/ - a simple game demonstrating how to use both Perkun and Perkun2 in your own projects.