Here is the User Manager, which as you might guess allows you to add users and groups and specify access controls for said users (or groups).

NT of course includes a disk management tool for directly managing partitions.

Here is the performance monitor tool, which allows you to look at various metrics the system collects and graphs them over time. This is present to this day in Windows, but no one ever uses it.

Finally, here is the Event Viewer, which is for looking at events logged to the system log. Later versions of Windows split this up into multiple different log "files", again similar to the syslog facility in Unix.

NT 3.1 includes the same Minesweeper and Solitaire from 3.1, but it also includes this Freecell game.