I've been using Jivochat for the last few weeks and can say that it's a really good piece of software. Specifically, it was quick and easy to install the chat on each web site and I could do it via Google Tag manager. The agent schedule works good. The mobile app is stable. The outgoing call feature using your current business phone number as its caller ID also worked flawlessly and was quick to setup (they need to verify that you own the existing phone number in order to use it in the caller ID).

In short, if you don't mind their branding everyone is complaining about, this is a great deal. It seems the team is set on just getting the word out on their software and not making money on appsumo... so no stacking codes to upgrade plans or such to remove their branding... an unfortunate decision in my view, but regardless this is the great deal for the price.