org.eclipse.ui
Interfaces 
IActionBars
IActionDelegate
IActionDelegate2
IActionDelegateWithEvent
IActionFilter
ICapabilityInstallWizard
ICapabilityUninstallWizard
ICapabilityWizard
IContainmentAdapter
IContributorResourceAdapter
IDecoratorManager
IEditorActionBarContributor
IEditorActionDelegate
IEditorDescriptor
IEditorInput
IEditorLauncher
IEditorPart
IEditorReference
IEditorRegistry
IEditorSite
IElementFactory
IExportWizard
IFileEditorInput
IFileEditorMapping
IFolderLayout
IImportWizard
IKeyBindingService
IMarkerActionFilter
IMarkerHelpRegistry
IMarkerResolution
IMarkerResolutionGenerator
IMarkerResolutionGenerator2
IMemento
INavigationHistory
INavigationLocation
INavigationLocationProvider
INestableKeyBindingService
INewWizard
INullSelectionListener
IObjectActionDelegate
IPageLayout
IPageListener
IPageService
IPartListener
IPartListener2
IPartService
IPersistableElement
IPerspectiveDescriptor
IPerspectiveFactory
IPerspectiveListener
IPerspectiveRegistry
IPlaceholderFolderLayout
IProjectActionFilter
IPropertyListener
IResourceActionFilter
IReusableEditor
ISaveablePart
ISelectionListener
ISelectionService
ISharedImages
IStartup
IStorageEditorInput
IViewActionDelegate
IViewPart
IViewReference
IViewSite
IWindowListener
IWorkbench
IWorkbenchActionConstants
IWorkbenchPage
IWorkbenchPart
IWorkbenchPartDescriptor
IWorkbenchPartReference
IWorkbenchPartSite
IWorkbenchPreferenceConstants
IWorkbenchPreferencePage
IWorkbenchPropertyPage
IWorkbenchSite
IWorkbenchWindow
IWorkbenchWindowActionDelegate
IWorkbenchWindowPulldownDelegate
IWorkbenchWindowPulldownDelegate2
IWorkbenchWizard
IWorkingSet
IWorkingSetManager
Classes 
NavigationLocation
PlatformUI
ResourceWorkingSetFilter
SubActionBars
XMLMemento
Exceptions 
PartInitException
WorkbenchException