Here are the data structures with brief descriptions:

[detail level 1234567]

▼NRsi
▼NFred
▼NComponent
CSession
▼NController
►NProvider
CDb
CRecord
►NView
►NHtml
►NBuilder
CFormat
CTable
►NWidget
CChar
CCheck
CColor
CDate
CEmail
CFile
CGrid
CGroup
CHidden
CLookup
CMemo
CNumber
COptions
CPassword
CSelect
CSorter
CTable
CTime
CBuilder
CWidget
CHtml
CJson
CRss
CTxt
CXml
►NWidget
►NGroup
CDateTime
CChar
CCheck
CColor
CDate
CEmail
CFile
CGrid
CGroup
CLookup
CMemo
CNumber
COptions
CPassword
CSelect
CSorter
CTable
CTime
CProvider
CView
CWidget
▼NDateTime
CDate
CDateTime
CTime
▼NDb
CMigrate
▼NDef
CRecord
▼NLog
►NHandler
CConsole
CFile
CHtml
CHttp
CMail
CMem
CStats
CHandler
▼NMinify
►NHandler
CScript
CStyle
CHandler
▼NSecurity
►NCheck
CCsrf
CInjection
CPath
CPolling
CThrottle
CUserAgent
►NServer
CConfig
CIntegrity
CCheck
CServer
▼NSocket
CClient
CServer
▼NStorage
►NContainer
CFile
CContainer
▼NStream
►NHandler
CCache
CResize
CHandler	Stream handler
CWrapper	Stream wrapper
▼NUser
►NAuthenticator
CGeoIp
CHttp
CMail
CPassword
CSubnet
CToken
CAuthenticator
CFiles
▼NWorker
►NJob
CMail
CPolling
CSql
CStats
CWorkflow
CJob
▼NWorkflow
CItem
CAlive
CCache	Wrapper for the Doctrine cache
CClient
CComponent	Basic component class
CController
CDb	Database access layer (PDO based)
CDebug
CDef
CEncrypt	Encryption (and decryption) component
CEntity	Entity manager component
CEvent	Event handler component
CException
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
CServices
CSocket
CStats	Statistics component
CStorage	Flexible storage component
CStream
CToken	Unique token generator/validator
CTrans	Translations component
CUser
CVars	Variables component (dynamic configuration)
CWorker
CWorkflow
CFred	Framework for Rapid and Easy Development
CThing	Basic object