APImetrics is an API monitoring and alerting service that includes a visual API designer, support for both REST and SOAP APIs (easing the move from the latter to the former), a workflow system. Postman is the complete toolchain for API developers, used by more than 5 million developers and 30,000 companies worldwide. Postman makes working with APIs faster and easier by supporting developers at every stage of their workflow, and is available for Mac OS X, Windows and Linux users.

The rise of RESTful APIs has been met by a rise in tools for creating, testing, and managing them. Whether you’re an API newbie or an expert on an intractable deadline, you have a gamut of services to help you bring your API from concept to production, and many of them won’t cost you a dime.
Following is a sampling of free services for working with APIs. Some are quick and dirty applications to ease the job of assembling or testing an API. Others are entry-level tiers for full-blown professional API management services, allowing you to get started on a trial basis and later graduate to a more professional level of (paid) service if and when you need it.
Amazon API Gateway
The Free Tier for AWS provides developers with no-cost access to most of the services AWS offers—including Amazon API Gateway. Your free Amazon API Gateway maxes out at one million API calls per month, and only lasts one year, but it’s enough to get you started.
The full, for-pay version of Amazon API Gateway allows you to build front-end APIs for applications built on Amazon EC2, AWS Lambda, or “any web application,” with meta-tools like traffic management, API version control, and monitoring all part of the package.
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About
RESTClient is a Java application to test RESTful webservices. It can be used to test variety of HTTP communications. There are two executables:
- GUI version (restclient-ui-X.jar download)
- Cli version for batch execution of .rcq files (restclient-cli-X.jar download)
Since 2007
The first version of RESTClient was released late 2007. Since then the tool has been in continuous development. Visit project news page for history of releases.
Download / Install
Mac users can use homebrew to install:
Release binaries are available from GitHub releases.
Archives of pre-GitHub era release-builds are available at WizTools.org Download.
Support
Post your queries in Google Group mailing list.
Book
Screenshot

3.7.1 release:
Rest Api Tool For Mac
More screenshots here: http://flickr.com/photos/subwiz/tags/restclient/
Subscribing to New Releases
Rest Api Client For Mac
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