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.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
httest - The httest provides a large variety of HTTP-related functionality, useful for implementing all...
Browsershots - Browsershots makes screenshots of your web design in different browsers.
Uier - Codeless or low-code User Experience test editing and management using Selenium to perform testing...
browserling - Live interactive cross-browser testing from your browser.