I'd start stopping to write things like this:
Addendum: Please answer if you have
experience with large-scale
projects/open-source projects and try
not to provide
hypothetical/theoretical ideas, but
practical, proven ones.
This kind of arrogant attitude actually kills more open source projects than anything else. Open source is less about source and more about collaboration. Welcome every one who wants to help, even when they do not have the practical experience to do such - helping open source projects to gain experience is common practice, as you probably know.
The second point is do not bother with promoting if you don't have working code. Go take a look at sourceforge or Google Code or wherever and see the sea of dead projects with nothing more than a few lines of code and a lot of good intentions. Code first, talk latter.
The best promotion is to have a "client": to have someone using your product so people can see it's actually in production. If it's a CMS: use it for the project site, for example.
If you have all of this your best bet in promotion is word-of-mouth. Ask for friends to use your project in their websites, for example. Blog about it and submit the article for aggregator sites like Digg or Slashdot but, please, don't do this if the project is not ready for prime time. No one wants to read about vapourware.
Good luck with your project.
'Framework' is a generic term.
Django is a web development framework built on top of Python. It provides commonly needed tools for creating a website: tools like connecting to a database layer, running a development server, rendering views, and routing requests to the correct controller are all provided by the framework.
Rails is a similar framework, just built on Ruby. Theoretically you could create a web app in just Python or just Ruby without the framework, but it would be a pain to rebuild all those tools from scratch.
Angular is a front-end framework for creating interactive HTML views out of standardized data structures - take a look at the section on their home page about 'wiring up the backend'. Angular does not have a way to 'save' data beyond basic Javascript tools like saving to cookies or local storage; it needs a backend system for that. It uses some of the same language to describe code organization (such as "MVC") but it is not providing the same tools.
Front-end frameworks do not do the same things as back-end frameworks, and indeed, sometimes one front-end framework doesn't do the same things as a different front-end framework.
Web developers use 'front-end' and 'back-end' frameworks for handling two different types of interaction with the user.
django can do both frontend as well as backend.
Unless I dramatically misunderstand Django's abilities, it cannot create dynamic in-page interactions such as modal pop-ups, live editing, etc. It can render HTML, yes; but it cannot make any text you type into the text box also appear on the page simultaneously.
Back-end frameworks such as Django, Rails, or Symphony are used to handle idempotent browser requests and HTTP calls. You load a page, the framework inspects the url that you have requested and builds the entirety of the page, piece by piece, and returns the whole thing to the browser. (APIs too)
There are some exceptions to this, but in general when you "navigate" around the internet, "back-end" systems are handling those requests. When you see the URL change and the whole browser window whites out for a moment, that is this type of navigation.
"Front-end" frameworks are more important for handling in-page user interactions. Things like modal pop-ups, loading more data via AJAX without loading a new page, submitting a form and displaying a message without redirecting, hover effects.
The simplest front-end framework that you can use is just HTML plus CSS. If you need more complex interactions, you can add Javascript to those tools. If your javascript is complicated or you are recreating common patterns, you might add jQuery for it's animation tools.
If you find yourself reimplementing an entire application (replacing the entire content of the page when you click certain links or take certain actions - a "Single Page App"), then you might use a Javascript framework like Angular to build up those interactions.
Rarely will you see a front-end-only web application. Just about any website or application will require some sort of persistent data storage - logins, page content, comments, product data, user-submitted content, anything. The backend framework then acts as a communication layer between the database and disk and the front end. It could do as little as providing a simple REST API for accessing/creating/editing data while the Javascript handles all templates and HTML, or it could build out HTML partials, and the Javascript front-end assembles them together, or it could assemble the entire page, and Javascript is used only for animations and occasional Ajax requests.
Best Answer
The short answer is no.
A CMS or content management system is basically an application built ( maybe/most likely on top of a web application framework ) for the purpose of providing rich tools to maintain, organize and add content dynamically to a website. Good examples would be Drupal, Joomla, DotNetNuke etc.
A framework is different in that it is far more generic. It's almost like the saying "Every square is a rectangle but not every rectangle is a square" in that most commonly every CMS comes built on top of a popular or in-house framework making it useful to extend but it lacks the true genericism to actually make it a framework.
Take expression engine. Expression engine is built on top of CodeIgniter but adds far more libraries, helper and functionality mostly geared towards content management. It would be hard to do the extra work to dumb down expression engine to create a new product that isn't a CMS compared to just using CodeIgniter ( The framework ).