Skype

Price: Free from tinyurl.com/yadw879g Skype is one of the few messaging platforms that is truly universal. While you can access it through the web or Outlook.com, Skype for Android is handy to have as a dedicated application on Chrome OS. The Android interface stays consistent with Windows and Mac, so you can hop over to your conversations without any issues. If you want to live on the edge, you can try out the Skype Preview version (free from tinyurl.com/ydyaxt37) to get the latest features first.