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I have two clear favorites about live support chats. A paid chat, and also rather expensive one for a small company, is Kayako. Their plans start from $29/mo per staff members and $599 when hosted on your servers.
Purechat is definitely my favorite from free support chats. You have to add a small code to the pages you want and you will have a control panel for the chat on their website.
Every service has own competitive advantage, whether it is price, reliability, level of support, scalability, certain features, etc. If you need a reliable system with tons of features and great 24/7 support, but don't mind the price, go with the market leader - Live Person. But if you are looking for a lower price, but still need a reliable and well-known service that has been on the market for a while, check out Provide Support.