ukelele

Install command: 
brew install --cask ukelele

Name: Ukelele

Unicode keyboard layout editor

https://software.sil.org/ukelele/

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

Cask code: ukelele.rb on GitHub

Current version: 3.6b7

Requirements: macOS >= 10.14

Analytics:

Installs (30 days)
ukelele 192
Installs (90 days)
ukelele 542
Installs (365 days)
ukelele 1,952