[akvlad]

I was looking for something like this a while back and found a useful firefox plugin called Poster (https://addons.mozilla.org/en-us/firefox/addon/poster/). It's useful for testing a RESTful api without creating any front-end code to handle the requests. Or anything you can do with cURL just simpler.

[suresk]

Hope a little bit of self-promotion isn't frowned upon - I have a similar app [1] on the Mac App Store. One nice thing it does is allow you to save a request in a a file, to be re-used later. A lot of folks I've talked to have used this to share test cases in a QA organization, and I think it can be kind of handy (although, the free browser-based ones are quite good, too).

I'm working on adding conversion to/from cURL and wget commands, which could be helpful when working with APIs that are documented with cURL examples.

It costs $2, but I'll give anyone who asks (well, up to 50 people at least) a free copy - my contact info is in my profile.

1. http://itunes.apple.com/us/app/graphicalhttpclient/id4330958...

[freestyler]

I wrote a similar one for chrome https://chrome.google.com/webstore/detail/cdjfedloinmbppobah...

[roller]

A coworker recently pointed us to yet another one of these, Dev HTTP Client, which has worked really well for us.

https://chrome.google.com/webstore/detail/aejoelaoggembcahag...