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Gromit-MPX is an on-screen annotation tool that works with any Unix desktop environment under X11 as well as Wayland.
Its main use is for making presentations of some application. Normally, you would have to move the mouse pointer around the point of interest until hopefully everybody noticed it. With Gromit-MPX, you can draw everywhere onto the screen, highlighting some button or area.
Devilspie2 is a window matching utility, allowing the user to perform scripted actions on windows as they are opened and closed.
Devilspie 2 is based on the excellent program Devil's Pie by Ross Burton. It will read Lua scripts from a folder and run them whenever a window is opened, and the rules in them are applied on the window.
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.
xmobar is a minimalistic status bar.
It's usable with any window manager in X11
and (via its text output mode) Wayland.
wlsunset applies day/night gamma adjustments for Wayland compositors
supporting wlr-gamma-control-unstable-v1.
SwayOSD is a GTK-based On Screen Display (OSD) for keyboard shortcuts such as
caps-lock and volume.
Lightweight volume notification for Linux.
Volnoti is a lightweight volume notification daemon for GNU/Linux and other POSIX operating systems. It is based on GTK+ and D-Bus and should work with any sensible window manager. The original aim was to create a volume notification daemon for lightweight window managers like LXDE or XMonad. It is known to work with a wide range of WMs, including GNOME, KDE, Xfce, LXDE, XMonad, i3 and many others. The source code is heavily based on the GNOME notification-daemon.
wob is a lightweight overlay volume/backlight/progress/anything bar
for wlroots-based Wayland compositors.
xidlehook is a general-purpose replacement for xautolock, written in Rust,
with a few extra features.
It executes a command when the computer has been idle for a specified amount of
time.
grobi automatically configures monitors/outputs for Xorg via RANDR.
It watches for changes in the available outputs
(when a connecting or disconnecting a display),
and automatically configures the current outputs via RANDR according
to available profiles.
darkman is a framework for dark-mode and light-mode transitions on UNIX
desktops.
It runs in the background and turns on dark mode at sundown, and turns it off
again at sunrise.
It's designed to run in the background.
Betterlockscreen is a fast and sweet looking lock screen for GNU/Linux systems
with effects.
A neat notification daemon.
Avizo is a notification daemon,
mainly intended to add multimedia keys support to tiling window managers (Sway).
improved tiling wm.
i3 is a tiling window manager for X11.
It primarily targets advanced users and developers.
STAnd aLONE TRAY (notification area) implementation for X11.
Stalonetray is a STAndaLONE freedesktop.org and KDE system tray
(notification area) for X Window System/X11 (Xorg or XFree86).
It has full XEMBED support and minimal dependencies: an X11 lib only.
Stalonetray works with virtually any EWMH-compliant window manager.
Linux multi-touch gesture recognizer.
Touchégg is an app that runs in the background and transform the gestures you make on your touchpad or touchscreen into visible actions in your desktop.
Auto-suspend inactive X11 applications. 
Save battery by auto-suspending unfocused X11 applications.
Modern GUI applications tend to use significant system resources, such as CPU time, even when they're not being actively used.
XSuspender configurably suspends application activity (using Unix signal SIGSTOP or a custom shell script) shortly after its window(s) loses focus. When the window regains focus, the application is transparently resumed exactly where it had left off.
systembus-notify is a system bus notification daemon.
It's a tiny daemon that listens for net.nuetzlich.SystemNotifications.Notify
signals on the D-Bus system bus and shows them as desktop notifications using
the user bus.
A simple GTK based notification daemon for SwayWM.
SwayNotificationCenter is a simple notification daemon with a GTK GUI for
notifications and the control center.
It supports Desktops and Window Managers with wlr_layer_shell_unstable_v1
support like Sway or anything wlroots-based
Stalonetray is a STAnd-aLONE freedesktop.org and KDE system tray
(notification area) for X Window System/X11 (e.g. X.Org or XFree86).
It has full XEMBED support and minimal dependencies: an X11 lib only.
Stalonetray works with virtually any EWMH-compliant window manager.