Reamaze is not that popular, but it is a top notch product. If you're looking for an all-in-one integration of knowledge base, customer support via Facebook, email and live chat, this is what you need. I tested almost all of the most popular apps out there but in the end, Reamaze is what I went with.
I love Reamaze! The android app although seems like it's a little unpolished. Needs to add attachments and a way to start a conversation. What's the point of having a mobile app and not be able to use the camera to send pictures to customers?
Added a Reamaze specific notification sound to help distinguish Reamaze notifications.