Calendr shows both reminders and calendar events. It works flawlessly and is my go-to app. Actually, because of its ability to show reminders, I prefer this to Itsy-Cal, my previous favorite.
This does a great job displaying both Calendar events and Reminders at the same time. Also allows using a small icon with the Day and Date, saving menu bar space (only show the time without a date from Apple). Works great and very useful.