This app was mentioned in 6 comments, with an average of 1.17 upvotes
https://play.google.com/store/apps/details?id=com.josegd.monthcalwidget&hl=en
https://play.google.com/store/apps/details?id=com.candl.chronos&hl=en
Two different apps, both called Month. Sync to Google Calendar I believe.
Month Calendar Widget for the calendar.
Business Calendar for the agenda.
It's called the Month Calendar Widget
Thanks! I'm running Cyanogenmod 12.1. The widget is called Month Calendar Widget.