Here you can see a list of all available form controls in the CMS. You can manage the items in the list using the appropriate icon on the left side - edit (), delete () and export (). New form controls can be created by using the New form control link.
The form controls in the list can be filtered by their Display name.
More resources can be found at Developer's Guide -> Development -> Form controls -> Overview.
Page url: http://devnet.kentico.com/docs/5_5r2/contexthelp/index.html?form_controls_list.htm