A Jasig courses plugin is available for Sakai at https://source.sakaiproject.org/contrib/jasig-courses-integration/. This plugin outputs XML representing the user's courses in the format expected by the Courses Portlet. This plugin is not currently capable of limiting results by semester.
A Moodle plugin is in-progress.
While no Blackboard plugin currently exists, the project would welcome a contribution from a Blackboard institution.