There were (though in 40 years I have never seen one) hydraulic variable pitch props, which were not governed. There are now electric VP props, for which the pilot must manage RPM.
Some old Bonanzas, Navions and others had variable pitch non-CS hydraulic props, diaphragm type Hartzells.
Electrically actuated props commonly have constant speed controllers. Curtiss and Beech both mass produced them a very long time ago. MT electric props and various microlight experimental props are current examples.