FROAuth2Request is a project mainly written in OBJECTIVE-C and C, it's free.
OAuth2 Support for the well known ASIHTTPRequest Lib
FROAuth2Request
FROAuth2Request sole purpose is to allow lovers of the fantastic ASIHTTPRequest library to extend it's usage to cover services that conform to the new OAuth2 spec. Note the (fortunately) the new OAuth 2 specification doesn't work with the old OAuth 1 spec.
The project isn't completely free standing and dependings on the following:
ASIHTTPRequest (DUH)
http://github.com/pokeb/asi-http-request/tree
json-framework
http://code.google.com/p/json-framework/
Lastly if you want to take advantage of the UnitTests supplied you need the fantastic GHUnit
http://github.com/gabriel/gh-unit
Comments, Forks and all the good stuff is welcome