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: 0.13.2

activitywatch is built for Intel macOS and so requires Rosetta 2 to be installed.
You can install Rosetta 2 with:
    softwareupdate --install-rosetta --agree-to-license
Note that it is very difficult to remove Rosetta 2 once it is installed.

Analytics:

Installs (30 days)
activitywatch 70
Installs (90 days)
activitywatch 212
Installs (365 days)
activitywatch 773
Fork me on GitHub