Functional Testing Tool: Selenium

1. QTP

2. Selenium

Selenium:  Selenium is a suite of tools to automate web browsers across many platforms. Selenium runs in many browsers and operating systems it  can be controlled by many programming languages.

Selenium IDE: Selenium IDE is a Firefox add-on that makes it easy to record and playback tests in Firefox 2+. You can even use it to generate code to run the tests with Selenium Remote Control.

latest released version 2.2.0

Selenium Remote Control: Selenium Remote Control  is a client/server system that allows you to control web browsers locally or on other computers, using almost any programming language and testing framework.

Download version 2.33.0

Selenium WebDriver: Selenium WebDriver can drive a browser natively either locally or on remote machines.

Selenium Grid: Selenium Grid takes Selenium Remote Control to another level by running tests on many servers at the same time, cutting down on the time it takes to test multiple browsers or operating systems.

Note: Above information is copied from this site http://docs.seleniumhq.org/docs/