The Ring doorbell has recently been given an upgrade, so it can now be connected to your Amazon Alexa. Connecting your doorbell to Alexa will enable you to access the doorbell through voice commands. All you have to do is set up your Amazon Alexa account and allow it to detect the Ring doorbell.
This will also enable Alexa to notify you when you have a visitor or if someone is at your front door. If you do not wish to get up and check who is at your door, you can just ask Alexa to do so for you, and it will be displayed on your Ring app.
Apart from Ring, even Google's Nest doorbells wired and wireless security cameras can work with your home system.