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Freshdesk is an award-winning, online help desk software that allows you to support customers over email, phone, the web or even through Twitter and your company's Facebook page. With Freshdesk there is nothing to download or install, you don't have to worry about server upgrades/patches and your agents can support customers from anywhere. Popular features include:

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.

UseResponse is a fully customizable, customer feedback software and support ticketing system with open code that you can place on your server or use in cloud.It can be used as FAQ, ideas bank, bug tracking system, testimonials or all-in-one support software.4 Platforms: feedback with ideas, help desk with ticketing, knowledge base, live chat with messengers

UserVoice communities are the easiest way to turn customer feedback into action: 1. Share ideas. 2. Vote up the best. 3. Respond, implement & repeat!Create Forum Free accounts & trials. Signing up in 60 seconds! UserVoice allows the customers to vote on feedback and ideas submitted in the customer community. There is a limit on the number of votes a user can spend at any given time.

OTRS is the leading help desk software solution that makes the communication with your clients more transparent and easier. From incidents to service requests, with the web-based Open Source help desk software, OTRS, no communication is lost and customer requests are routed automatically to the right service team, ensuring they are answered more quickly. Free of license costs and with an open and flexible architecture OTRS makes it possible for service organizations to build a customized and powerful service management solution resulting in high-quality service at minimal operational cost. Since Version 5 OTRS offers responsive design and works on any mobile device. A new chat feature including webRTC based audio and video chat, appointment calendar for improved team collaboration and resource planning plus fully encrypted messaging is now available. »

Intercom shows you who is using your product (the user's region, browser, local time etc.) and makes it easy to personally communicate with them through targeted, behavior-driven email and in-app messages.

Zendesk Chat (formerly Zopim) is a simple chat widget that lets you sell directly to your website visitors.

Kayako is effortless customer service software that helps teams be more productive and build customer loyalty.

Live chat for website and messenger support. Be there when your customers need you the most.

User or customer feedback system with voting facility about proposals done by users. Similar function as the UserVoice system.

Mibew Messenger (also known as Open Web Messenger) is an open-source live support application written in PHP and MySQL. It enables one-on-one chat assistance in real-time directly from your website.

InvGate Service Desk is a web-based ITIL-ready solution with an unprecedented user interface. Code-free config for Incident, Problem, Change, Asset & Knowledge processes. Smart ticket management, workflow automation & unmatched user collaboration.

Lime Talk is an online application that allows you to easily embed a chat widget onto your site. In a couple of minutes you can communicate with your website visitors and increase your sales and provide better customer support.

UserEcho gives you the opportunity to create a modern Community to support customers in a few minutes. It includes support forum with the possibility of voting for ideas, Helpdesk, Knowledge Base and Online Chat.