tawk.to Live Chat

Fantastic app for live chat. Not only is the livechat app free, there are plenty of customisation and such. There has been plenty of updates over the months and the improvements are great, e.g. automated message sent to customer when he/she is browsing the website.

IMO, the only draw back is that it is not entirely compatible with some themes. Otherwise, this would be my go to livechat app.