What does selenium do ?
You can use opensource(ie free!) - Selenium tool ( selenium IDE is a plugin to firefox) to record and playback tests like WinRunner, QTP. You can then export the recorded test in most language e.g. html, Java , .net , perl , ruby etc. The exported test can be run in any browser and any platform using "selenium remote control".
What are the components of selenium ?
Selenium IDE - Plugin to Firefox to record and play test in firefox and also export tests in different languages.The most appealing format is the html test case which seems to based on fit html.
Selenium RC- Allows playing of exported test in different platform/OS.
Selenium Grid - Allows to control lots of selenium machines.
