These are instances of fully configured MoinMoin virtual servers.
You can get MoinMoin running in minutes if you have the appropriate virtualization tool.
Different virtualization tools:
Please note that those virtual machines are usually made by MoinMoin users, not by MoinMoin development. Executing binary code you downloaded somewhere from the internet means that you have to trust the party who offered the download.
We suggest that you offer a *.md5sum file additionally to your download (or just post the md5sum), so that the user downloading it can at least check he got what you announced here. Also, please provide some contact details if you offer VM images here.