FireShot: web pages capturing tool for IE & Firefox

FireShot is a screen shot tool that can capture just the webpage you are looking at. It can capture the visible area or the entire page. The free version is useful for basic capture/save. You can find FireShot here.

Firebug: well known web debugger tool

Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. You can get it here

FireGestures: execute various commands with mouse gestures

A customizable mouse gestures extension which enables you to execute various commands and user scripts with five types of gestures. You can get it here

Google Notebook

Web application useful for storing short notes or ticket templates, etc. You will be required your Google account and can access it here