itsycal

Install command: 
brew install --cask itsycal

Name: Itsycal

Menu bar calendar

https://www.mowglii.com/itsycal/

Cask JSON API: /api/cask/itsycal.json

Cask code: itsycal.rb on GitHub

Current version: 0.15.6

Current version requires: macOS >= 10.11

Versions:

Intel catalina 0.14.1
mojave 0.14.1
high sierra 0.11.17
sierra 0.11.17
el capitan 0.10.16

Analytics:

Installs (30 days)
itsycal 858
Installs (90 days)
itsycal 2,851
Installs (365 days)
itsycal 11,325
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