https://plus.google.com/+RomanNurik/posts/byKoTdvbJFZ

Here's the link to the compiled apk: http://goo.gl/Y3bNs8

This is a beautiful widget, but Roman said he will not be compiling it and publishing it on the PlayStore. Here's a link to the compiled APK,http://goo.gl/Y3bNs8, and it's repo on GitHub:

https://github.com/romannurik/Android-MonthCalendarWidget

One last thing. This isn't DigiCal or Jorte. It's not meant to be, so take it as is.