Be aware that content there has slowly fallen out of date as VisIt has evolved. This is particularly true of user content. More of the developer content remains current. Consequently, we have been migrating content from the old wiki to our new ReadTheDocs pages. There, we believe such content is more likely to remain current as we now employ a docs-like-code development workflow. We’ve started with key user tutorials.
Migrating content involves converting it from WikiMedia format to reStructuredText. If anyone is interested in helping us in this quest, please get in touch with us by opening a new Make VisIt better discussion.