Tencent QQ - Tencent QQ is a free instant messaging computer program developed by the Chinese company Tencent Holdings Limited.
PieMessage - iMessage on Android
Miranda NG - Miranda NG is a successor of a popular multi-protocol instant messaging client for Windows - Miranda IM. Very light on system resources and extremely fast.
Big Ass Message - The most useful single-serving site on the World Wide Web.
AirMessage - Use iMessage on any Android phone 💬
IM+ - Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Goo...