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

[detail level 123]

CI_Benchmark
CI_Calendar
CI_Cart
CI_Config
CI_Controller
AccountSettingsAdvocate
AccountSettingsAuthor
AccountSettingsChair
AccountSettingsReviewer
approvement
AssignChair
AssignedReviewers
AssignManual
AssignReviewerAdvocate
assignto
CheckStatus
ConferenceAuthor
ConferenceChair
ConferenceCreate
ConferenceRegistration
ConferenceReviewer
displaystatistics
Download
Edit
EditConference
EditConference2
EditSubmission
evaluatesubmission
Home
InterestArea
Login
MakeSubmission
MakeSubNewUser
Messages
Mycal
NewMessage
Payment
ReadMessage
SuggestedInterestArea
SuggestedInterestAreaShow
Upload
ViewFile
ViewSubmission
viewsubmissionchair
votesubmission
CI_DB
CI_DB_cubrid_driver
CI_DB_mssql_driver
CI_DB_mysql_driver
CI_DB_mysqli_driver
CI_DB_oci8_driver
CI_DB_odbc_driver
CI_DB_pdo_driver
CI_DB_postgre_driver
CI_DB_sqlite_driver
CI_DB_sqlsrv_driver
CI_DB_Cache
CI_DB_driver
CI_DB_active_record
CI_DB_forge
CI_DB_cubrid_forge
CI_DB_mssql_forge
CI_DB_mysql_forge
CI_DB_mysqli_forge
CI_DB_oci8_forge
CI_DB_odbc_forge
CI_DB_pdo_forge
CI_DB_postgre_forge
CI_DB_sqlite_forge
CI_DB_sqlsrv_forge
CI_DB_utility
CI_DB_cubrid_utility
CI_DB_mssql_utility
CI_DB_mysql_utility
CI_DB_mysqli_utility
CI_DB_oci8_utility
CI_DB_odbc_utility
CI_DB_pdo_utility
CI_DB_postgre_utility
CI_DB_sqlite_utility
CI_DB_sqlsrv_utility
CI_DB_result
CI_DB_cubrid_result
CI_DB_mssql_result
CI_DB_mysql_result
CI_DB_mysqli_result
CI_DB_oci8_result
CI_DB_odbc_result
CI_DB_pdo_result
CI_DB_postgre_result
CI_DB_sqlite_result
CI_DB_sqlsrv_result
CI_Driver
CI_Cache_apc
CI_Cache_dummy
CI_Cache_file
CI_Cache_memcached
CI_Driver_Library
CI_Cache
CI_Email
CI_Encrypt
CI_Exceptions
CI_Form_validation
CI_FTP
CI_Hooks
CI_Image_lib
CI_Input
CI_Javascript
CI_Jquery
CI_Lang
CI_Loader
CI_Log
CI_Migration
CI_Model
AccountSettings_model
approvement_model
CheckStatus_model
Conference2_dropdown
Conference_dropdown
Conference_model
displaystatistics_model
evaluatesubmission_model
Fee_dropdown
Mycal_model
reviewer2_dropdown
Reviewer_dropdown
score_dropdown
Submission_model
uploadedfiles_model
votesubmission_model
CI_Output
CI_Pagination
CI_Parser
CI_Profiler
CI_Router
CI_Security
CI_Session
CI_SHA1
CI_Table
CI_Trackback
CI_Typography
CI_Unit_test
CI_Upload
CI_URI
CI_User_agent
CI_Utf8
CI_Xmlrpc
CI_Xmlrpcs
XML_RPC_Client
XML_RPC_Message
XML_RPC_Values
CI_Zip
language
XML_RPC_Response