ZDoom Wiki

I'm sure there's a more appropriate place to ask this (such as the ZDoom forums), but is there somewhere I can get a downloadable version for offline viewing of the Zdoom WIKI?

i dont think there is any, since the wiki is constantly updated

It was discussed on the Zdoom forum. I think the conclusion was that there is no easy solution.

It should be fairly straight-forward. The export page allows you to download pages from the Wiki in an XML format. You just need to give it a list of all the pages on the Wiki, which can be found here.

The most straightforward way would be to download a database dump (like the one for the Doom Wiki).

Unfortunately it doesn't seem like Randy has made that available.