Quentin has touched on the answer, but I suspect you're looking for something a little meatier. The technologies you've referenced are all very "front-end." And they work great if you're building a small, static website. But once the site begins to grow you start to need a little extra help to keep things manageable. This help comes in the form of a "back-end."
The "back-end" today will usually be built using an existing framework. The popular programming languages all have multiple frameworks available, but some examples to help you get an idea: Python has Django, Groovy has Grails, Ruby has Rails, and PHP has Drupal.
In large part these back-ends are built towards dynamic websites (that is, the content probably comes out of a database) rather than static websites (where the content may live entirely in HTML files).
Something advertising itself more as a CMS (Content Management System) is going to focus more on static-style sites, but doing the repetitive tasks for you. The content may end up coming out of a database, but it probably doesn't have traditional, relational attributes that you'd normally find in data stored in a database. By which I mean, the CMS may take paragraphs of text and store them in database for convenience rather than storing data like Users/Profiles/Forum Threads/Comments/etc.
Given what little information you've provided and based on the technologies you've listed a CMS is probably more what you're looking for than an entire back-end framework.
The end goal is to help you focus more on creating content and less on just getting the content displayed.
Hopefully that gives you enough information to guide your search and help yourself figure out what exactly will work for your needs. Unfortunately I don't know of any good resources off-hand that will help you figure this stuff out. I'd recommend doing some reading on Content Management Systems and maybe work through a few tutorials. Essentially you'll be taking the skills you already have and figuring out how they fit inside a system someone else has built.