Seven common tools used to understand what is happening in a system-Histograms,Flow Charts,Scatter Diagrams,Pareto Charts,Cause-and-effect Diagrams,Check Sheets and Control Charts

Mercury QuickTest Professional™ provides the industry’s best solution for functional test and regression test automation - addressing every major software application and environment. This next-generation automated testing solution deploys the concept of Keyword-driven testing to radically simplify test creation and maintenance. Unique to QuickTest Professional’s Keyword-driven approach, test automation experts have full access to the underlying test and object properties, via an integrated scripting and debugging environment that is round-trip synchronized with the Keyword View.

Web-based tool for management of test cases for software and hardware testing. Plan, edit, run, and report on your QA testing.

Part of the Tutorials for Continuous Quality Improvement.

Has a free trial of e-Test Suite.

500+ software QA testing tools, training courses, QA jobs, tester certification, testing glossary, white papers.  Open source and commercial tools: unit, functional, GUI, performance, regression, compatibility testing, bug tracking, test management.

This site has got some good articles on Quality and Testing. It is not easy to navigate to articles but the articles are very good and helpful

There are two Tools here eValid and Testworks. If you are considering testing tools then these are worth a look.

Only downloading and installing will teach you a lot about Testing.

Check out some great content on this site

SpiraTest provides a complete Quality Assurance solution that manages requirements, tests, bugs and issues in one environment, with complete traceability from inception to completion. In addition, it allows you to drill down from each of your captured requirements to determine how many test cases have validated the functionality, and status of each of the defects logged.

An information resource for software testers.Exhuastive FAQ.

The site has Test Tools List:

* Bundled Tool Suites
* Defect Tracking
* GUI Test Drivers
* Load and Performance
* Miscellaneous
* Static Analysis
* Test Coverage
* Test Design Tools
* Test Drivers and Test Suite Management
* Test Implementation
* Unit Test Tools
* Other Sources of Tool Information

A comprehensive list of all Testing Tools

A starting point for an IT professional looking towards understanding the qaulity principles and resources.