To get MuMaMo you have to get nXhtml.
mumamo requires Emacs 22 or later.
Note: The recommended and supported way to use mumamo is by loading nXhtml.
mumamo is a library for cooperation of multiple major modes in a buffer. mumamo divides the buffer into chunks, each with its own major mode.
A description of how mumamo-mode works with this is here:
In Emacs you normally have only one major mode per buffer. However especially in web development it is common that a file consists of chunks that corresponds to different major modes in emacs.
mumamo defines what I call “multi major modes” which you call just as major modes to setup the buffer (ie find the chunks and assign major modes to them). Those multi major modes normally have names like html-mumamo, eruby-html-mumamo, django-html-mumamo, smarty-html-mumamo etc.
If you want to edit for example php files then you can use html-mumamo or nxhtml-mumamo (which is a bit more powerful).
In the out of the box cases above (with main major mode nxhtml-mode) you just load nXhtml (which in turns loads mumamo), open your file and do
nxtml-mumamo-turn on is one of those “multi major modes” I mentioned above. (You can of course also add nxhtml-mumamo to auto-mode-alist and in fact it is already added to this in nXhtml.)
Please do not put any bug reports, suggestions or question here. Instead use launchpad, see nXhtml.
The work with MuMaMo was partly sparkled with my desire for something that could handle multiple major modes with NxmlMode or its derivatives (like nxhtml-mode, part of nXhtml) as the main major mode. MuMaMo can do that - with what I think acceptible price that fontification is instead handled by html-mode. (Actually this may look better in many peoples opinion since it uses the same color scheme as the submodes then.)
In the first version of mumamo there was a minor mode mumamo-mode, but that has now disappeared (it disappeared in nXhtml version 1.10). Instead there are now multi major modes, like nxhtml-mumamo. This was an idea that I got from RMS and that has hopefull made mumamo much easier to use.