8x8 Cloud Contact Center - 8x8 Cloud Contact Center is a VoIP call center solution.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Five9 - Five9 provides cloud-based call center software for sales, marketing and support.
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Aspect Via Customer Engagement Center - Aspect Via is a customer engagement platform that covers all the customer service bases while taking full advantage of Amazon Web Service (AWS) cloud services and infrastructure.
JivoChat - JivoChat is a live chat that enables you to talk to visitors on your website