FeatherTest is a free, open source Google Chrome extension to serve as a quick way to build simple tests and automate processes, you can also use it to register accounts or fill forms with data. It is really flexible, you can use any JavaScript and jQuery code to write your tests, doesn't need any server setup and once the test is written anyone in the team can run them from their browsers.
Documentation and examples: http://xaviesteve.com/5302/feathertest-automated-website-testing-extension-google-chrome
Source code: https://github.com/luckyshot/feathertest
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!