We use Olark for years and it's free and it also has an JS interface where your website code can interface with it (populate user info if logged-in, etc.). It i

We use Olark for years and it's free and it also has an JS interface where your website code can interface with it (populate user info if logged-in, etc.). It is far from perfect but it gets the job done when you want the customer to quickly contact you. I see now they put some more "unlock to get" things on their website but still their free offering is good enough. The only limit is after 20 live chats you get emails instead. For us we use it mostly for getting the initial question (in offline mode) and then we take it further via email.