Whatsapp alternative are numerous via the internet and many people have been using quite a limited number of them before now. For the fact that, whatsapp is currently the trending mobile chatting app for now really set it on a cute platform that makes it calls for competition.
As you may have known that whatsapp work virtually on all devices except some Java phones, then there should be a close substitutes for whatsapp in the same wise. Some of whatsapp alternative also work on PC such as whatsapp alternative for PC and/ or whatsapp alternative for iPod. Read the complete list here http://adetechblog.com/top-whatsapp-alternative-for-free-chatting/