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WatiN (pronounced as What-in), WatiN has grown into an easy to use, feature rich and stable framework. WatiN stands for Web Application Testing In .NET, and it's a framework that enables web application testing through Internet Explorer.
The way that WatiN works is very "easy", knowing that there's a lot of work behind a framework like this. WatiN lets you open Internet Explorer instances, and through interop, interact with the elements in a form.
With WatiN, you can get and set values from the elements in a form, and you can fire events of any of the elements in the document too. WatiN is developed in C# and aims to bring you an easy way to automate your tests with Internet Explorer and FireFox using .Net.

Watij stands for Web Application Testing in Java. Watij is a Java API created to allow for the automation of web applications. Inspired by the simplicity of Watir and enhanced by the power of Java, Watij automates functional testing of web applications through real web browsers. WebSpec is Watij’s new cross browser and cross platform api for testing web applications. It works with IE, Mozilla, and Safari on their respective platforms for Windows, Linux, and Mac. You can write your scripts using Java or Ruby (via JRuby). Watij’s WebSpec API provides a JRuby extension so you get the power of Ruby and Java combined.

DbUnit is a JUnit extension (also usable with Ant) targeted at database-driven projects that, among other things, puts the database into a known state between test runs. DbUnit has the ability to export and import the database data to and from XML datasets. Since version 2.0, DbUnit can also work with very large datasets when used in streaming mode. DbUnit can also help to verify that the database data match an expected set of values. DbUnit includes a comprehensive test suite.