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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. No catch. No spam. No wares. It's truly free and always will be.

UserEngage is a full business-client communication platform including live chat, user tracking, marketing automation, CRM and emailing. It takes 5 minutes to implement and it is two times cheaper than nearest competition.It is aimed at increasing egagement and conversion rates with as little effort as possible.

Banckle Chat is a online chat & customer support solution. It is fully customizable and includes a variety of built-in templates, themes, widgets and tools for boosting customer service productivity. It achieves the great scalability by allowing multiple websites, multiple departments and multiple operators. You get all the freedom to customize the support structure as you like. Other important live support features like canned messages, file sharing, SSL encryption, proactive invitation, visual and sound notifications are also supported. You can also track visitors and monitor their browsing activities using the analytics & reporting features. »

ClickDesk offers a magic box of live chat, voice chat, help desk and social toolbar for websites. ClickDesk is cloud-based; not needing users to download or install any software. Agents receive chats on their favorite IM such as Skype and Google Talk.The built-in voice chat functionality allows visitors to call businesses through Browser phone, Skype or the Local Access numbers available in 40 countries. The ClickDesk interface also includes a first-of-its kind social toolbar, enabling users to Tweet or like a Facebook page right from the chat window. ClickDesk recently launched an easy-to-use Help desk feature for businesses to efficiently manage support e-mails and offline chat messages; making it a complete multi-channel communication solution. »

PPMessage is an open source customer communication platform with the backend written in Python.