Process Management Terminal Tools
A process is a running program with its own memory, file descriptors and place in the process tree. Unix has managed them from the terminal since ps, kill and the shell's job control.
Tools in this category list and filter processes, draw the tree, send signals, find what is holding a port or an open file, restart services under systemd, and keep long running jobs alive. See also top and system monitors for the live resource view.
Below is a list of terminal tools for process management.

bottom
Yet another cross-platform graphical process/system monitor.
Yet another cross-platform graphical process/system monitor.

gruyere
A tiny (and pretty) program for viewing + killing listening ports.
A tiny (and pretty) program for viewing + killing listening ports.

hapless
Run and manage background processes.
Run and manage background processes.

htop
An interactive process viewer.
An interactive process viewer.

isd
A keyboard-focused, highly customizable systemd units TUI.
A keyboard-focused, highly customizable systemd units TUI.

lsoff
A CLI / TUI that lists listening TCP/UDP ports.
A CLI / TUI that lists listening TCP/UDP ports.

mprocs
Run multiple commands in parallel.
Run multiple commands in parallel.

nvitop
An interactive NVIDIA-GPU process viewer and beyond.
An interactive NVIDIA-GPU process viewer and beyond.

pctrl
A terminal-based process controller.
A terminal-based process controller.

pgtree
Unix process hierarchy tree for specific processes.
Unix process hierarchy tree for specific processes.

pik
A TUI for interactively stopping processes.
A TUI for interactively stopping processes.

process-compose
A scheduler and orchestrator to manage non-containerized applications.
A scheduler and orchestrator to manage non-containerized applications.

procmux
A terminal multiplexer for processes.
A terminal multiplexer for processes.

procs
A modern replacement for ps written in Rust.
A modern replacement for ps written in Rust.

pueue
Manage your shell commands.
Manage your shell commands.

pvw
A terminal-based (TUI) port viewer in Go
A terminal-based (TUI) port viewer in Go

systemctl-tui
A fast, simple TUI for interacting with systemd services and their logs.
A fast, simple TUI for interacting with systemd services and their logs.

systemd-manager-tui
A TUI for managing systemd services.
A TUI for managing systemd services.

winproc-tui
A keyboard-first process monitor for Windows 11.
A keyboard-first process monitor for Windows 11.
Know any terminal tools that would be good for this list? Post a Tool here!