GBWhatsApp is an enhanced and customized mod of original WhatsApp. It is based on WhatsApp Plus mod which was discontinued by the WhatsApp creators when they streamlined WhatsApp.
The WhatsApp plus Mod stayed in circulation and due to that we have the GBWhatsApp which you can easily customize if you are a developer. GB WhatsApp has a tweaked UI for added features and uses the same license and protocol as the WhatsApp.
You can use this application to discover the hidden features of Whatsapp. Best app to enjoy two different accounts on same device. You can hide your online status, send larger video files, more than 90 pictures can be send at once rather than 10 pictures in whatsapp.