Heel is a small static web server for use when you need a quick web server for a directory. Once the server is running, heel will use (http://rubygems.org/gems/launchy/) to open your browser at the URL of your document root. Heel is built using (http://rack.github.com) and (http://puma.io) % heel Launching your browser... Puma starting in single mode... * Version 3.11.3 (ruby 2.4.3-p205), codename: Love Song * Min threads: 0, max threads: 16 * Environment: none * Listening on tcp://0.0.0.0:4331 Use Ctrl-C to stop Or run it in the background % heel --daemonize Launching your browser at http://0.0.0.0:4331/ % heel --kill Sending TERM to process 3304 Done.