Hi Alisa,
At the University of Minnesota, we use Amion.
We are also developing our department’s use of QAgenda, an overall physician scheduling platform that has an automatic link to Amion for handling the call schedule (Call assignments are tasks assigned to any provider, along clinics, or time, conferences, etc.) In other words, what QGenda can do imports automatically to Amion, which is a good thing; you don’t have to have two (or more!) different calendars going.