TestLink enables easily to create and manage Test cases as well as organize them into Test plans. These Test plans allow team members to execute Test cases and track test results dynamically, generate reports, trace software requirements, prioritize and assign tasks. Read more about implemented features and try demo pages.
The tool has web based interface with PHP and background database MySQL, Postgres or MS-SQL. It cooperates with known Bug tracking systems as is Bugzilla, Mantis, etc.
TestLink is web based tool under the GPL license (free to use). The project is maintained by Open community of testers.
Download: TestLink 1.8.0