Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
wxFormBuilder - wxWidgets is an excellent framework that enables the creation of multi-platform applications with...
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...