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

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

AltUnity TesterFree
UI Test Automation for Unity applications
AirtestFree
Cross-Platform UI Automation Framework for Games and Apps

AutoItFree
Automate the Windows GUI and general scripting

SikuliXFree
Automation of GUI components with mouse and keyboard actions.

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

JubulaFree
Jubula Functional Testing Tool for desktop Java applications

FlaUIFree
UI automation library for .Net