AutoIt

Automate the Windows GUI and general scripting

Airtest

Cross-Platform UI Automation Framework for Games and Apps

AltUnity Tester

UI Test Automation for Unity applications

Nexial

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

Prestige

A text-based HTTP client in the browser, an interface-less Postman.

Bug Severity Calculator

Calculate severity of a bug

FlaUI

UI automation library for .Net

Jubula

Jubula Functional Testing Tool for desktop Java applications

PyWinAuto

Windows GUI Automation with Python (based on text properties)