Paw is a full-featured HTTP client that lets you test the APIs you build or consume. It has a beautiful native OS X interface to compose requests, inspect server responses and generate client code out-of-the-box.
This is one of my go-to tools, when test-driving my API endpoints.
“Copying text to the clipboard shouldn’t be hard. It shouldn’t require dozens of steps to configure or hundreds of KBs to load. But most of all, it shouldn’t depend on Flash or any bloated framework. That’s why clipboard.js exists.”