GroupMe is described as 'Group messaging platform owned by Microsoft. It's absolutely free, whether you're talking to a group of friends, or texting with one person. Best of all, it works on nearly every phone, via push or SMS. With GroupMe, it's easy to reach anyone, anytime, anywhere' and is an app in the Social & Communications category. There are more than 50 alternatives to GroupMe for a variety of platforms, including Android, iPhone, Android Tablet, Windows and Mac. The best alternative is Telegram, which is free. Other great apps like GroupMe are Signal (Free, Open Source), Element (Free Personal, Open Source), Tox (Free, Open Source) and WhatsApp (Free).
XendApp provides a messaging gateway for reaching public or internal users through applications for a variety of devices. Messages can be sent directly from http://xendapp.com web site or through any of the existing web services that the web site have.
Mileo, an application designed for groups you have in your life, can make your life easier by saving you the time and your privacy by keeping you from sharing your cell phone number and email address with anyone.
This new chat app that comes with great bundles to spike your business and personal life. For a free video call, messaging, group chat, share pictures and digital wallet. Work for both iOS and Android.
Pen Pals® is a new and refreshing way to meet and chat with people. Just send out a letter and you’ll receive replies from people around the world. Earn stamps, collect rewards and explore the world - one new friend at a time.
All of your private messages (Email, Facebook, Twitter, Instagram etc.) through a single login. A single timeline, a unified contact list and simplified searches to manage all your private messages. Unified message management