Professional web development has become increasingly dependent on ability to incorporate data from various sources to create excellent end user experience. Because API applications and services are the main component for information exchange on the web, various types of tools are required for development and testing of these services. HttpMaster focuses on development and testing of API services that are based on REST architecture and supports all important REST principles and properties like methods (GET, POST), data formats (XML, JSON), and dynamic parameters of various data types. Main HttpMaster strengths are elegant user interface, simple workflow, and extensive help tips and topics available while working with the product. You can choose between multiple product editions; `Express` can be freely downloaded and used, while `Professional` requires purchase of a lifetime license. Both editions can be obtained from the product website and require PC with Microsoft Windows operating system.