I created www.wargamewiki.com which runs on MediaWiki (what Wikipedia uses). Right now, anyone can make edits and create pages without having to make an account (though uploading and inserting images requires creating an account). If spam becomes an issue, it may become editable only by users with accounts, but I'd prefer it be open to edit and so am starting that way.
I have moved the TOAW IV community manual into the wiki. In doing so, I reorganized/renamed some sections, put information into tables for readability, supplemented some content with screenshots, removed many section references numbers and replacing them with textual interwiki links, converted text equations into formatted equations, etc.
The pages still need more organization (e.g., I pulled out game calculations to its own page, but it has content in it that are other parts of the appendix), there are still section number references to replace with wiki links, but it's getting there.
The page that still has a lot of stray scenario numbers is 'Creating Scenarios' (covering the scenario editor). I welcome everyone to have a look and make edits.