activitywatch

Install command: 
brew install --cask activitywatch

Name: ActivityWatch

Time tracker

https://activitywatch.net/

/api/cask/activitywatch.json (JSON API)

Cask code on GitHub

Current version: 0.12.2

Analytics:

Installs (30 days)
activitywatch 67
Installs (90 days)
activitywatch 197
Installs (365 days)
activitywatch 676
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