LightDM

LightDM is a cross-desktop display manager that aims is to be the standard display manager for the X.org X server. The key features ( as listed by upstream ) are:


 * A well-defined greeter API allowing multiple GUIs
 * Support for all display manager use cases, with plugins where appropriate
 * Low code complexity
 * Fast performance

LightDM on Gentoo
LightDM is available on Gentoo Linux and supports the following useflags


 * branding = Installs a Gentoo specific background and requires the gtk useflag
 * gtk = Installs the gtk greeter
 * qt4 = Installs the Qt4 greeter
 * introspection = Uses the dev-libs/gobject-introspection for instrospection