OSS1 SAP Online Service System
SM13 Update monitor. Will show update tasks status. Very useful to determine why an update failed.
S001 ABAP Development Workbench
SE01 Old Transport & Corrections screen
SE10 New Transport & Correction screen
SE09 Workbench Organizer
SE16 Data Browser: Initial Screen.
SE30 ABAP/4 Runtime Analysis
SE36 ABAP/4: Logical Databases
SE37 ABAP/4 Function Modules
SE38 ABAP Editor
SE39 Splitscreen Editor: Program Compare
SE41 Menu Painter
SE51 Screen Painter: Initial Screen.
SE71 SAPscript layout set
SE80 ABAP/4 Development Workbench Object Browser
SM12 Lock table entries (unlock locked tables)
SM21 View the system log, very useful when you get a short dump. Provides much
more info than short dump
SM35 View Batch Input Sessions
SQ00 ABAP/4 Query: Start Queries