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

Snarl - Snarl is a notification system for Windows.

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

Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.

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

Hubgets - Chat, voice, and video turning team communication experience into knowledge to help your business get more productive