The OERu Blog Feed Finder
One of the distributed tools that the OERu makes available as part of its open source distributed digital learning environment is WEnotes. I've described what it is and how it works previously.
WikiEducator Notes: OERu's course feed aggregation and messaging system
Here at the OERu, we provide a service, attached to all of our online courses (and available to all of our partners - or anyone else for that matter) which allows anyone involved in those courses to communicate with their peers from any one of a dazzling array of online "places" with WikiEducator Notes (aka WEnotes). The entire system is free and open source software (FOSS).