I'm pleased to announce the first release of DataBasin, a tool which allows to access Data on SalesForce.com using its WebService APIs. Core part of the tool is the API implementation in Objective-C, which uses the GNUstep WebServices for the low-level interaction.
The API implementation is designed to be reusable in other application and is LGPL'd.
Basic functionalities like Query, Insert and Delete are implemented (and of course log-in!) but the tool contains many rough parts, like the CVS importer/exporter so production use is not yet recommended.
As far as I know this is the only open source library for Salesforce.com, at least in Objective-C.
In the screenshot DataBasin running on Debian GNU/Linux.
A big thanks to many friends who helped me implementing the API and debugging the SOAP Calls. First of all Richard Frith-MacDonald who extended the GSWS to support SOAP in the first place. Then two colleagues, Andrea Rosa and Enrico Murru who helped track down many bugs.