It's been a while since I've dabbled in Seaside, and, wanting to play around with it again for a small project, I downloaded the one-click image for Pharo and thought I'd look through the documentation to get my bearings. (There is a related question about performance differences between two of these, and one about which ones can server static files, but neither explains the differences between all of them.)
The first image of A Walk on the Seaside shows two available servers in the "Seaside Control Panel": WASwazooAdaptor and WAComancheAdaptor. The download page for Seaside on Pharo says you can start either Zinc, Kom, or Swazoo as your web server, and that either of them is available as an adaptor from the Seaside Control Panel. However, that panel in my newly downloaded image only has WATestServerAdaptor, ZnZincServerAdaptor, ZnZincStaticServerAdaptor, and ZnZincStreamingServerAdaptor. The second of these is the only one available by default.
I gather from all this conflicting information that Zinc is the latest one to use, at least on Pharo - is that correct? Are the other ones all outdated? Or do they each have their strengths and weaknesses, and need to be added to the image (e.g. via Monticello)? Are Kom and Swazoo only for Squeak? When would I use the three different Zinc servers on Pharo? I'm hoping someone can clear up my confusion.