Processes

What is running, from ps, listed again on every keystroke because the set changes constantly (an input palette; the root only has its own row). The query matches the name or a pid prefix. The row is the executable's name, its full path the subtitle on macOS (Linux ps gives only the name); the pid and the resident memory sit on the right, and a process above 10% CPU carries a NN% cpu tag (amber, red from 50%). Rows are sorted by CPU, then memory. On macOS a process that lives in a .app bundle gets that app's icon.

A query of : and digits lists what listens on TCP ports instead of processes: :3000 that port, :30 every port starting with 30, : alone every listener. One row per process and port with the port as a blue tag and the address as subtitle; a process ps knows gets its usual numbers and icon. ss -ltnp on Linux, else lsof -iTCP -sTCP:LISTEN (macOS ships it). A row's id is pid:port, and it has the same actions.

The filter dropdown (tab cycles it) scopes the list:

Keyboard

A kill that fails (a process of another user, a pid that is gone) keeps the panel open with a toast carrying the OS's message.

Setup

Nothing to install: ps is everywhere, lsof ships with macOS, ss with most Linux distributions (without either the port query shows one hint row saying which to install). Open in Activity Monitor types the pid through System Events, which asks for Automation once and needs Accessibility for the keystrokes; without it the app just comes up.

Settings, [extensions.processes]:

What it does not do

• Kill by name: the rows are processes, one pid each. Type the name, then kill the rows you mean, one at a time.
• Killing another user's process: no sudo, so the toast carries the OS's refusal.
• Other signals: SIGTERM and SIGKILL only.
• UDP or remote sockets: the port query lists TCP listeners.
• pal's own host process is left out of the list.

Platforms

macOS and Linux. The full path as subtitle, app icons and Open in Activity Monitor are macOS; kernel threads and ss are Linux.