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Eviware, the maker of soapUI, Web Service Testing Leader

Runscope helps you monitor, log and measure API usage to solve API problems fast. Automatically monitor APIs without any coding. Runscope provides complete logging for all of your API traffic. Track down troublesome API calls with powerful search. Debug problems by peering into the details of every request and response. Works with any public or private API, behind the firewall or in the cloud.

A free open source, native Apple OS X app for testing HTTP/REST endpoints

APICombo is a user-friendly API and website testing and monitoring tool.

Debug The Api is a simple but powerful tool for developers to build and analyze datas from http request based apis. When we are developing an application, we usually need to call several apis from web server in order to get datas. Finding apis’ changes (maybe bugs) and rebuild models in a quick way is what Debug The Api attend to do. Api developers and app developers can use it to find out problems. There also special function for Objective-C and JAVA developers, which is, generating source code of data models and api calling method code. Everything will be done just as easy as you can imagine in order to save those times spent on looking for errors of returned datas in plenty lines of log and writing data model code inflexibly. »

gURL is a free, Open Source (GPL) HTTP request generator tool.

RESTtest is a simple yet intuitive way to test RESTful web services and standard HTTP calls. RESTtest allows you to enter a HTTP request body and any necessary headers. After the request is submitted, response information can be both viewed and saved to disk.

Crosscheck Networks designed SOAPSonar from the ground-up as a comprehensive testing solution with features that can be utilized throughout all phases of the service development lifecycle. SOAPSonar is easy to deploy and requires no knowledge of SOAP, XML, or WSDL to be effective. Services can be tested within minutes, and more complex testing scenarios can be built including complex security, identity, automation, and performance

Tools and resources for Enterprise Web Service development.

A Simple Windows application to help developers debug REST based services.