  Quality of Service (QoS) has gained more importance with the increase in
usage and adoption of web services. In recent years, various tools and
techniques developed for measurement and evaluation of QoS of web services.
There are commercial as well as open-source tools available today which are
being used for monitoring and testing QoS for web services. These tools
facilitate in QoS measurement and analysis and are helpful in evaluation of
service performance in real-time network. In this paper, we describe three
popular open-source tools and compare them in terms of features, usability,
performance, and software requirements. Results of the comparison will help in
adoption and usage of these tools, and also promote development and usage of
open-source web service testing tools.
