I've seen a lot of stuff dropped in the base OS X Mountain Lion, but around in other locations. For example, to get the command line tools, you have to get XCode, then go into the XCode preferences and download the command line tools. X11 is now a separate open source project called XQuartz that you have to download in order to get that X11 support that use to come with the Mac.
All the CalDev stuff has been moved off to OS X Server and I suspect, but can't verify that those Subversion Apache modules are also in OS X Server which is a $20 purchase.
Of course, you can try CollabNet's Subversion Edge which is free. However, it's a community binary which means it's not from CollabNet itself, and it's marked as being for Mac OS X 10.7. It installs itself in the /opt directory and contains its own version of Apache with all the required modules for Subversion.
If I find anything else, I'll let you know.