Code
We have setup a code repository on Google Code for gathering libraries and other supporting examples. These libraries are contributed by members of the community and have not been tested or are necessarily known to work.
If you would like to test them and report issues, please visit our Issue Tracker.
C#
Eran Sandler has contributed a basic C# class that performs signing.
ColdFusion
Harry Klein has contributed a ColdFusion library which is also listed at RIA Forge.
Objective-C
Jon Crosby has released an OAuthConsumer and OAuthTestSuite for Objective-C for Mac developers. The OAuthConsumer framework is available in the repository and Jon has also written up Using OAuthConsumer, a complete guide to using the OAuthConsumer framework for Mac apps.
Java
A Java library and examples were contributed by John Kristian, Praveen Alavilli and Dirk Balfanz.
OAuth for Spring Security is also available, contributed by Ryan Heaton. This project is not hosted in the OAuth repository.
Javascript
John Kristian has contributed a Javascript Library.
Jifty
Shawn M Moore has written an OAuth Plugin for the Jifty Framework.
Perl
Keith Grennan has written a Net::OAuth in Perl.
PHP
Andy Smith has written a basic PHP library for OAuth.
Python
Leah Culver has written both a library in Python and offered an example implementation.
Ruby
Blaine Cook, Pelle Braendgaard and others have written a library in Ruby.
Others
We still need Javascript libraries and examples.
Mark Atwood is working on mod_auth_oauth. Michael Mealling is working on support for SiteMinder. Anthony Webb and Dave Hoff of IMified are working on an OAuth ColdFusion library.