Make Your Own Alexa Commands
You can make your own Alexa commands using IFTTT. This service is called If This, Than That. It allows you to connect to a wide range of other services using "recipes" that you create or that you borrow.
The best part about this is that you don't need to know how to make a recipe to use these services. You can look for a range of Alexa commands on IFTTT and add them to your account.
Here's a long list of things you can have Alexa do with IFTTT. The options include finding your phone, adding Alexa to do's to an external list like Todoist or Evernote, creating iOS reminders from your Alexa shopping list and much more.