Free BPM?

A post on the BPM Insights Blog listing Free BPM Modelling Tools recently caught my eye.

Firstly I thought it would be good to have a simple list of all of the available tools, so I have compiled a list, see the Process Tools (Free) category on my Process on the Web page.

Secondly, it would also be good to compile reviews of these tools, as I have found it difficult to assess the value that I am going to receive using one of these tools. Therefore, I will be looking for existing reviews, or to review some of the tools myself, in upcoming posts.

Do you know of any free tools that I should add to the list?  Or do you have any good reviews (maybe one you wrote yourself) of a free Process Tool?