GroupMe

GroupMe is the best way to chat with everyone you know. Its free, whether youre talking to a group of friends, or texting with one person. Best of all, it works on nearly every phone, with a smartphone app or via SMS. With GroupMe, its easy to reach anyone, anytime, anywhere.
On GroupMe, you can catch up with your family, get a group together for a night out, coordinate with co-workers, or just gossip with a few of your closest friends. Think about it like your own private Twitter, just for the people you really know. Or like a faster, better reply-all email.
No matter how you think about it, you wont know how you lived without it once you give it a shot.- -Gizmodo
Now a part of the Skype family.
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FEATURES
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Chat with a group
Start groups with the people already in your phones address book no need to remember usernames or PINs.
The conversation starts instantly. The app uses your data connection, so even Android tablets can join in on the fun.
When you have a poor connection, the app will let you start receiving your messages via SMS instead. Youll never miss a thing!
Share the group with people you want to join with a simple URL. Its perfect for when you dont have everyones phone number or when youre not sure who will want to chat with you.
Get fancy with it
Share photos inline take them on-the-go or choose them from your Camera Roll. Check out the Gallery to see all the photos shared in each group.
Split costs with the members of your group. Just attach a Split to a message and anyone in the group can chip in with a credit card.
Attach your location to any message so nobody gets lost.
Give your group an avatar choose anything that represents your group.
Tap the heart next to any message to like- it and spread some love.
Send a private message
Take your private conversations outside the group.
Its just like free texting send all the messages you want and youll never pay a cent.
Connect the app just once, and well keep you up to date with push notifications. No need to log in every day it just works.