DrupalREST.NET is a project mainly written in ..., it's free.
DrupalREST.NET
A .NET class library written in C# to interface with the Drupal REST Server
All Development done on Drupal 7 with the Services module (http://drupal.org/project/services)
Copyright (C) 2011 Randall Kent [email protected]
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.