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
CloudTalk - Work locally, grow globally
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Zadarma - A new generation of VoIP for your business. Zadarma offers virtual phone numbers in 100+ countries, cloud PBX, and CRM systems.
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
Sonetel - Sonetel is a communication app that lets you make an international business call at the cost of local calls.