The best alternatives to Plaaying are Simplify for Mac, Skip Tunes, and Emcee. If these 3 options don't work for you, we've listed a few more alternatives below.
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NepTunes is a desktop accessory that allows you to see and control your music (Apple Music, Spotify) with customizable shortcuts, built-in scrobbler for Last.fm, and beautiful widgets.
hRemote helps you to control your music stream to AirPods/earbuds/headphones via Apple Watch: 1. Skip songs by twisting/tilting your wrist forward (check out iPhone app for a demo). 2. Change volume level by scrolling digital crown. 3. Play/pause via button.