Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Zopim - Live chat is a faster and more personal way for you to engage your customers. Free for 14 days. No credit card required.

Crisp Chat - Multi-channel customer support software

Chatra - Live chat software that helps to increase revenue and collect feedback providing an easy way for website owners to talk to visitors in real time.

Mutiny - Personalize your website for each visitor

Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.