There is a huge range of cultivators available, mostly cultivators are designed with a tillage system in mind.  Starting from a minimum tillage system using machines like the straw rake, you can go to the other end of the spectrum to a heavy cultivator like the Sumo Trio.  One of the most popular cultivators of recent times has been the short disc.  Machines like the Simba X-press and the Vaderstad Carrier are an excellent all-round light cultivator which are equally adept straight onto stubble or breaking down ploughing.