MightyText is a free Android app that allows you to view incoming calls and texts on your computer desktop and tablet. It's most handy with texting, allowing you to respond from your keyboard as easily as you would an email. Since notifications are sent to your desktop, you also avoid the distraction of checking your smartphone from time to time. It even has a nifty feature that shows to what percentage your phone is charged.
For full disclosure, I have no relationship with MightyText or its creators beyond being a happy customer.