It's a cross-platform Node.js desktop automation framework.
Best Tools For Desktop Automation
Browse 9 + Desktop Automation Tools
nutjs

Nexial
Test automation for everyone - test automation platform with support for web (selenium), desktop, database, api and much more. Coding not required ;-)

AltUnity Tester
UI Test Automation for Unity applications
Airtest
Cross-Platform UI Automation Framework for Games and Apps

AutoIt
Automate the Windows GUI and general scripting

SikuliX
Automation of GUI components with mouse and keyboard actions.

PyWinAuto
Windows GUI Automation with Python (based on text properties)

Jubula
Jubula Functional Testing Tool for desktop Java applications

FlaUI
UI automation library for .Net