Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
UBot Studio - Ubot Studio allows you to make ANY automation software you want without ANY programming experience.
TestingWhiz - TestingWhiz is a codeless test automation tool for software, mobile and web.
Repeato - Automate mobile app testing – with no code, in minutes.
Usetrace - Web app testing system that doesnât require coding or constant updating
Watir - Watir stands for Web Application Testing In Ruby. It facilitates the writing of automated tests by mimicking the behavior of a user interacting with a website. CommunityWatir stands for Web Application Testing In Ruby.