UPDATE: The Mass Text App has had a major update. You can see the review I did on the app here, or just download the new app from the Google Play Store.
There are many Android apps that let you send out mass texts (even the default message app lets you do that). The problem is when you want to send out a mass text repeatedly to the same group of people or when you want to send out a text for a recurring event.
There is a new app that does just this. The app is called Mass Text (download at the Google Play store). (New Version) The nice thing about this app is that you can create groups of contacts and templates with variables.
Let's suppose for a minute that a few times each month you have a movie night where you invite a group of friends over to watch a movie with you.
First you will create a new group. Add all the friends you want to come over and see a movie.
Once you have set the time variable it will allow you to send out your message after verifying the message is how you want it.
This is nice because it allows a group message that is a little more personal. People like seeing their names and when a text like this is sent, they might think that you wrote to them individually (having recently graduated from college, there is a big difference in the probability of me going somewhere if I get a mass text rather than someone just sending me a message).
Try out the app! Here is the Google play store link. (New Version)