maintserve is a program that serves Go issues and CLs over HTTP, so they can be viewed in a browser. It uses x/build/maintner/godata as its backing source of data.
It statically embeds all the resources it uses, so it's possible to use it when offline. During that time, the corpus will not be able to update, and GitHub user profile pictures won't load.
maintserve displays partial Gerrit CL data that is available within the maintner corpus. Code diffs and inline review comments are not included.