From Publisher’s description:

With ReadyDesk you can offer your customers several options to help them get their issues resolved quickly. They can open tickets from the customer portal, browse the support articles in the knowledge base for self service, create tickets automatically by sending you an email and even chat with you live online…

Basic features:
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Pricing: From 29.95 USD /month/ unlimited agents

Visit: http://www.readydesk.com/