General information about your ftrack server can be found at the System settings ‣ General Settings ‣ About page.

On this page you can find:

Summaries
Displays number of users, projects, versions, notes feed items and different objects.
ftrack version
The version of ftrack you’re currently running.
License
Information about your license such as when it expires and the number of users allowed.
API package
Link to the API package for your server.