A free program for Android, by StickyApple.com.

Just Chat is an easy-to-use quick chat application that offers live chats with no registration required. There are no limits to the number of rooms, and you can join any room instantly. It makes it easier to chat with new and potential friends and strangers. Just Chat is the perfect option for those who want to make new friends and chat with people in your country or even worldwide. No registration is required, no requirements at all. The goal is to bring people together without any registration and give chatters a place where they can be themselves without having to worry about any of that kind of stuff.