Selenium
Selenium is a web testing tool that runs on the browser and imitates like a user operating the application. Selenium is an excellent tool to automate some of the functionality tests. The Selenium IDE which is a firefox extension can help in recording and playing back the actions on a web application. The recorded script can be stored as a test case and run any time. Selenium on Rails is a plugin for rails that can help testing rails application easily. Here is an excellent screen cast that demonstrates using selenium on rails. On the whole Selenium is a great tool really helps in greater productivity and help in delivering quality applications.
