GroupMe

I realize I am obnoxiously behind the times when it comes to embracing the goodness that is GroupMe but it's possible that you are as well, so it's worth a quick share. Basically, it's an ultra deluxe, free, messaging system that works across all platforms - iOS, Android, Blackberry, Windows, Web - and degrades gracefully for those that don't have the supported tech. It's what you imagine group texting should be (and probably will be in 5 years time). If you've ever sent a text to more than one person at a time, this is essential.