The topic of this thesis is the issue of software testing. The thesis places main emphasis on tools to support test management, manual and automated functional testing and last but not least the tools for defect tracking. The aim of this thesis is introduce readers with software testing, especially with tools that can be used to support testing. The aim is offer an overview of the basic commercial and freely distributed tools for test management, manual testing, automated functional testing and defect tracking. Another aim is design criteria that simplify selection of tool. The second aim of this thesis is practical example of the configuration and description of the basic work with tools IBM Rational - ClearQuest, ClearCase, Manual Tester ...