Source Systems here seems to be synonomous with Source Types above.
4. ETL+ Source Object Creators/Managers
These 10 functions are shown in a menu when Add Source is selected. Each are represented in the UI as a page/window. As a group their role is to create, maintain and manage the Source Objects shown on the Source Objects panel. Each of them represents a technology for connecting to and querying/extracting data from various source systesm.