Reamaze!

osTicket is a widely-used open source support ticket system. It seamlessly integrates inquiries created via email, phone and web-based forms into a simple easy-to-use multi-user web interface. Manage, organize and archive all your support requests and responses in one place while providing your customers with accountability and responsiveness they deserve.

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.

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:

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.

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.

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

Help Scout scales like any other help desk, but the customer experience is personalized like a normal email.

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.

We make live chat solutions that work the way people work.

Desk.com lets you see all your customers in one place and engage them across all your support channels (Twitter, Facebook, phone, email, chat and discussion boards) in one easy-to-use desktop. Be there for your customers — anytime, anywhere.

Tidio Chat; a solution that allows you to increase contact with your clients.

Crisp is a freshly new alternative to existing bulky live chat platforms, which focuses on:

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