Every release, newest first.
The first version
Overview: CPU, memory with pressure, network and battery with live graphs, memory by type, every core and the busiest apps.
Apps: every app with its helpers grouped under it, sorted by CPU or memory. Quit or Force Quit after you confirm.
Ports: what's listening and who can reach it, with a Stop button.
Disks: free space and a folder tree of the startup disk, measured in the background.
The readout command: the same readings in Terminal, each with --json.
Automatic updates: a check once a day, or Updates › Check for Updates….