Have you ever wanted to send a text message from your desktop or WiFi enabled Android using your cell phone number? MightyText enables just that. Unlike some other Android/Desktop apps that just let you view your texts, MightyText lets you actually reply from whatever device you are currently viewing the message on.
Setup is rather simple, just visit this page http://mightytext.net/install. As the instructions show, first install the app on your Android Phone and activate it. You will still be able to use your preferred texting app on your phone, like Hangouts or the new Google Messenger. Next, follow the steps for your particular browser or Android Tablet. The MightyText web app works Chrome, Firefox, Safari, Opera, and IE. For those looking for desktop notifications, Chrome and Firefox both have Extensions/Add-Ons that give you text notifications.
All this for free.
MightyText also provides for a Pro Version for a small fee which allows you to schedule messages, apply themes, create contact lists, templates, bulk texts, and many more useful features.
Definitely check this app out.