Utilities

f.lux – free and open source program that adjusts the color temperature of the monitor in accordance with the geographical location and time of day set by the user

Redshift – free and open source program for automatic control of the screen temperature

KRuler – free and open source on-screen ruler for measuring pixels for Linux

eViacam is a free and open source mouse replacement program that moves the cursor when the head moves

Caffeine – free and open source utility for disabling the screensaver in Linux

Meteo is a free and open source weather forecast program for the coming hours and days with data and maps

Moneta is a free and open source utility for tracking the exchange rates of various currencies for the Linux desktop

MediaInfo is a free and open source graphical utility for viewing information from audio/video files

GNOME Clocks is a free and open source simple program that includes world time, alarm clocks, stopwatch, and timer

Identity – free and open source program for comparing multiple versions of an image or video