Excerpt from the README available at https://github.com/jrconlin/oauthsimple
OAuthSimple - a very simple OAuth 1.0 signed request generator
See source comments for usage examples
OAuthSimple aids in building valid OAuth 1.0 requests. It does not perform token requests by itself, however you can use it to build the request calls.
I've tried to build the library to be fairly common so that if you're familiar with how it works in one language, you can use it in any other. Right now the following languages are supported: PHP, Javascript, Perl, Python. I'd love to add additional languages and may do so in the future. (I'd be happy to accept contributions, hint, hint.)
Guido Schlabitz has provided a useful example for how to use OAuthSimple to connect to Google http://github.com/jrconlin/oauthsimple/blob/master/php/example.php
OAuthSimple accepts arguments in a variety of formats and returns a structure containing valid elements, including a fully structured URL, an Authorization header and the signature value. You should only use either the Authorization Header (as per the spec), or the fully structured URL. (Again, see source comments for appropriate usage.)
OAuth Developers may be interested in my OAuthTestPage at: http://jrconlin.github.com/OAuthTestPage/
This will display OAuth1a valid elements and values so you can verify things are working correctly.
Code is released under a BSD licence.