This next emulator is completely different from the others on our list. With ARChon, you can run Android apps in Google Chrome. Yes, Chrome OS runs Android apps, but this is for the browser. See the benefits? A lightweight emulator right inside your favorite web browser.
ARChon isn't the easiest emulator to get up and running, but once you do, you'll love the ability to quickly load apps and APK's into Chrome. First, you add ARChon to your browser, then you upload Android APK's you want to open and run.
You can use this with PC, Mac, or Linux, which will surely be what someone is looking for. If you're struggling with setup, just remember that the results are worth it. Here's more information, too.