Functional testing verifies that each function of the software programme executes as specified. Functional testing is a QA approach that heavily relies on black box testing. It is more concerned with the outcomes of processing than with the source code of the application. There are various functional testing tools available to help with software testing automation. Some of these software testing tools are licenced, while others are open-source and free. TestForma is the best functional testing tool for centrally controlling your whole testing process.