The University of Washington's Groups Service sends all group change events to Amazon SNS. An Amazon SQS queue listens on this topic and is read by a .Net program called the UWWI Group Sync Agent. The source code is available under an Apache 2.0 license on BitBucket at https://bitbucket.org/uwitiam/group-sync. Feedback and contributions from the community are welcomed.
There are numerous documentation links from the two readme files in the repository.