kwm - window manager
kfm - file manager
kdm - login manager (xdm replacement)
kcc - KDE config tool
kvt - xterm replacement
... and too many more to list here ...
I have not yet tested the functionality of kdm, but there seems
to be a problem with decoding the screenlock password, so it may
be wise to use KDE with xdm for now (or to use startkde, which
also shows what to add to your .xsession file, if you want to
stay with xdm).