I guess you mean to install apache modules as DSOs without recompiling apache.
This is in general possible using apxs
, if you have used "--enable-so" when you configured apache.
For example if you want to build mod_dav, go into the subdirectory modules/dav/main of the apache sources and run:
/usr/local/apache2/bin/apxs -i -a -n dav -c mod_dav.c
I've used the default /usr/local/apache2 installation directory. If you have installed apache in some other directory, change the path to apxs accordingly.
Regarding mod_dav_svn is an external module that is provided by subversion. You can get subversion sources, extract the tarball, go into subvsersion-1.x.x/subversion/mod_svn_dav and run:
/usr/local/apache2/bin/apxs -i -a -I../include -c mod_dav_svn.c
About mod_ssl, IIRC it's possible to be built afterwards as a DSO, but it's a bit tricky
Hope that helps