omniplan

Install command: 
brew install --cask omniplan

Name: OmniPlan

Project planning and management software

https://www.omnigroup.com/omniplan/

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

Cask code: omniplan.rb on GitHub

Current version: 4.9.3

Current version requires: macOS >= 10.11

Versions:

Apple Silicon big sur 4.6
Intel big sur 4.6
catalina 4.2.7
mojave 4.2.7
high sierra 3.13
sierra 3.10.4
el capitan 3.7.3

Analytics:

Installs (30 days)
omniplan 31
Installs (90 days)
omniplan 66
Installs (365 days)
omniplan 250
Fork me on GitHub