Create a static web site from a dynamic one

I have a need to create a static archive of a fairly large web site currently written in ASP and ASP.NET. The site uses a proprietary CMS, and has a set of forums.

I would like to login as a user and basically create a static version of that site based on that user's perspective.

Is there such a tool? I've used httrack in the past. I've been hearing a lot about jekyll and other tools. Would any of these work better? Anything interactive would be good too. For example, something that downloads based on me browsing to specific pages.

Any help is appreciated.