Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.

f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.

Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...

Eye Saver - Free software for eye protection and more!

Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...

CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder