polybar is a fast and intuitive to use tool for creating status bars.
It aims to help users build beautiful and highly customizable status bars for
their desktop environment,
without the need of having a black belt in shell scripting.

• polybar @ GitHub.

xmobar is a minimalistic status bar.
It's usable with any window manager in X11
and (via its text output mode) Wayland.

Taffybar is a GTK-based desktop information bar (status bar),
intended primarily for use with XMonad,
though it can also function alongside other EWMH compliant window managers.
It's similar in spirit to xmobar,
but it differs in that it gives up some simplicity
for a reasonable helping of GTK 3 eye candy.