SE80 ABAP/4 Development Workbench
SE03 Groups together most of the tools that you need for doing transports.
SE09 Workbench Organizer
SE11 ABAP/4 Dictionary Maintenance
SE12 ABAP/4 Dictionary Display
SE16N Table Browser (the N stands for New, it replaces SE16).
SE17 General Table Display SE24 Class Builder
SE30 ABAP/4 Run time Analysis
SE36 ABAP/4: Logical Databases
SE37 ABAP/4 Function Modules
SE38 ABAP Editor
SE39 Split screen Editor: Program Compare
SE41 Menu Painter
SE43 Maintain Area Menu
SE51 Screen Painter: Initial Screen.
SE54 Generate View Maintenance Module
SE61 R/3 Documentation
SE63 Translation
SE71 SAP script Layouts Create/Change
SE72 SAP script styles
SE73 SAP script font maintenance (revised)
SE75 SAP script Settings
SE83 Reuse Library.
SE91 Maintain Messages
SE93 Maintain Transaction.
