Leading Opensource testing frameworks

The age of Selenium

When talking about testing websites and the spacial use case involving "analytics" setups, It turns out that both simple and complicated analytics setups require about six testing sessions. When working with large web sites analytics setup tend to get broken routinely. While custom alerts can help to detect large disasters, automated testing tool is invaluable for tracking these type of failures early.

Oxygen IDE

Oxygen is a new Selenium framework and integrated development environment. Oxygen IDE allows recording on Internet Explorer, Firefox and Chrome. which is a significant improvement considering that Selenium IDE, which has not been has been updated for a long time, only supports recording in only. Oxygen supports recording in chrome and other browsers. Besides being an IDE is has command line interface as well as an API. Another advantage is that it records to JavaScript which means that the work flow can be 100% JavaScript and browser based.
When a test fails it allows automated capture of the UI image for later inspection. The reports are in XML which is ideal for a CI system like Jenkins.
Oxygen is also able to Interface with restful web services and with databases - allowing for a very complete testing solution in a single package. 

Ruby based testing stack 

Watir, Ruby, Cucumber are opensource tools that automate end to end testing at scale, on a high volume website.

In this way the QA automation engineers are an integral part of the Continuous Deployment process.
The technology used for testing are:

• Ruby
• WATIR
• Cucumber 
• The PageObject Gem
• Grid Grouper (legacy grid component)
• Selenium Grid and Grid Extras 
• Jenkins for CI

WATIR and PageObject Gem which reduces setup and overhead of working directly with Selenium.
Grids are then used to farm out tests on multiple browser simultaneously both for production and for staging and Jenkins does Continuous Integration. by using these tools you are able to get both manual and automated QA to involve more developers in coding tests.

Robot Framework 

By using the open source Robot Framework  it fits into continuous integration life-cycle.
The Robot Framework is a highly flexible test automation framework it relies on Python keywords.
Its advantages are its mature libraries, informative reports, and ease of use for QA engineers.
The keywords allow layering the testing code into a number of levels. The top level with the high level keywords reads like English and the low level keywords are implemented in Python and are much closer to the actual SUT. All in all the Keyword solution seems very similar to Cucumber.