runa is an independent project from jbpm. they are doing similar things as we are doing. i don't know why they want to go their own way instead of collaborating with us on the same codebase....
It's a pity, really, because both projects seem to be serious. I liked the web interface of runa because you can manage tasks, process definitions and configurations in a unique and friendly environment. I hope both efforts could merge someday so that we all can take benefits from both solutions.