This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12345]

CClient
▼CDateTime
►CDateTime
CDate
CTime
▼CException
CException
▼CMessageComponentInterface
CServer
CSession
▼CThing	Basic object
CFred	Framework for Rapid and Easy Development
►CComponent	Basic component class
CAlive
CCache	Wrapper for the Doctrine cache
CClient
CController
►CView
CHtml
CJson
CTxt
►CXml
CRss
CDb	Database access layer (PDO based)
CMigrate
CDebug
CDef
CEncrypt	Encryption (and decryption) component
CEntity	Entity manager component
CEvent	Event handler component
CFront	Front controller component
CHint
CHtml
CLocal
CLocation
CLock
CLog
CMail
CMessage
CMinify
CPdf
CProxy	Proxy for files that are outside of the public document root
CRequest	Component comprising all information regarding an HTTP-request (to transport these along all stepts executed during a request)
CRouter
CSecurity
►CCheck
CCsrf
CInjection
CPath
CPolling
CThrottle
CUserAgent
►CServer
CConfig
CIntegrity
CServices
CSocket
CStats	Statistics component
CStorage	Flexible storage component
CStream
CToken	Unique token generator/validator
CTrans	Translations component
CUser
►CAuthenticator
CGeoIp
CHttp
CMail
CPassword
CSubnet
CToken
CFiles
CVars	Variables component (dynamic configuration)
CWorker
CWorkflow
►CProvider
CDb
CRecord
►CBuilder
CFormat
CTable
►CWidget
►CChar
CColor
CEmail
CLookup
CTable
CCheck
►CDate
CTime
CFile
CGrid
CGroup
CHidden
CMemo
CNumber
►COptions
CSelect
CSorter
CPassword
►CWidget
►CChar
CColor
CEmail
CMemo
CPassword
►CTable
CLookup
CCheck
►CDate
CTime
CFile
CGrid
►CGroup
CDateTime
CNumber
►COptions
CSelect
CSorter
CRecord
►CHandler
CConsole
►CFile
►CHtml
CMail
CHttp
CMem
CStats
►CHandler
CScript
CStyle
CServer
►CContainer
CFile
►CHandler	Stream handler
CCache
CResize
CWrapper	Stream wrapper
►CJob
CMail
CPolling
CSql
CStats
CWorkflow
CItem