Selenium - Web app testing tool

Selenium is a suite of tools such as Selenium IDE, Selenium Remote Control and Selenium Grid to test the web application. Selenium IDE is an integrated development environment for Selenium scripts. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. It supports record and playback.

Selenium Remote Control (RC) is a test tool that allows you to write automated web application UI tests in any programming language against any HTTP website using any mainstream JavaScript-enabled browser. It is great for testing complex AJAX-based web user interfaces under a Continuous Integration system.

Selenium Grid transparently distribute your tests on multiple machines so that you can run your tests in parallel.