Selenium

Selenium automates browsers. That's all! First of all, it is for automating web applications for testing purposes, but it is certainly not limited just that. Boring web-based administration tasks can (and should!) be automated. Selenium has support from some of the major browser vendors who have taken (or are taking) steps to make Selenium an embedded part of their browser. It's also a core technology in countless other browser automation tools, APIs and frameworks.