I am researching agent based frameworks for Java and want one that is simple and easy to implement. Google search uncovered jade, wade, and jac.
I only have experience with Jade and it is a powerful Agent-Based framework with a decent user interface and has active community using and maintaining it.
From the website description, Wade seems to be a layer over Jade that supports Workflows so it is not a replacement but a complement.
Also, take a look at Jadex it implements advanced concepts than Jade e.g. mentalistic but still compatible with Jade to some extent.