You can find navigators on all main tabs.
List of navigators (and search panes)
Here's the list of all navigators, by main tab:
Articles main tab: Articles, Wires, Editorial, Tark4, Tasks, Products, Clipboard
Pages main tab: Pages, Wires, Editorial, Tark4, Libraries, Masters, Results, Tasks, Products, Clipboard, Collections
Tracking main tab: Layouts, Editions, Pages
Shell main tab: Editorial*, Wires*, Content*, Editions*, Collections*, Pages*, Searches*, Tark4*, Clipboard
Publishing main tab: Destinations, Wires, Editorial, Tark4
Contacts main tab: Contacts*
Planning main tab: Tasks*, Budgets*, Events*, Users, Contacts, Clipboard
Collections main tab: Collections*, Categories*, Clipboard
Trash Can main tab: no name*
Reports main tab: no name*
Note
The asterisk * marks the search panes that appear in the Navigator zone. In such combination, the results are displayed in the main listing and not on the Navigator's zone.
Where to re-configure navigators?
Where can I find navigators code and description?