A free app for Android, by ericolszewski.

If you want to prank your friends and family, then Text Bomb is the best application for you to download on your phone. Text Bomb allows you to send a lot of messages to your chosen recipient on your phone’s contact list. Of course, you don’t have to individually send the messages again and again to a specific recipient because you can actually input the number of times you want to send the message you created. You can also set the time in minutes and seconds for you to send a particular message. This application has a simple and user-friendly interface for you to prevent any issues and challenges that you are going to encounter while using the app.