The Rally .NET SDK by Joshua Stupplebeen interacts with the API, even though Rally Software does not maintain the kit actively. User guide provides links to access REST API and Web Services documentation. For support, ask a question at http://stackoverflow.com/questions/ask?tags=rally
Hewlett-Packard is looking to make its application testing tools more accessible than ever via implementations that are hosted in the cloud. Developers can access these tools via RESTful APIs. Kelly Emo, director of product marketing for HP Software, says that by making HP LoadRunner 12 and HP Performance Center 12 available as a cloud service, HP is making a concerted effort to introduce a broader spectrum of organizations to its application testing tools.