l is a Mac utility that lets you send custom notifications from your Mac. In many ways it&#8217;s been subsumed by Notification Center, but it&#8217;s still got some skills&#8212;like the ability to trigger actions other than displaying an alert bubble&#8212;that OS X doesn&#8217;t offer by itself. The Prowl app <a href="https://www.Prowlapp.com/installation.php">comes with a Growl plug-in</a> that allows you to set Growl to trigger a Prowl notification on your iPhone (and, yes, Apple Watch).</p>

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