Freshdesk!

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.

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.

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

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. »

Price: FREE, Language: PHP/MySQL, Type: Web-based, Features: unlimited tickets, categories, knowledgebase, attachments and more.

Zammad is a web based open source helpdesk/customer support system with manyfeatures to manage customer communication via several channels like telephone,facebook, twitter, chat and e-mails. Do you receive many e-mails and want to answer themwith a team of agents?

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.

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

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

Jitbit HelpDesk is helpdesk software that has same price for ANY number of technicians. And it has everything a help-desk needs: 2-way email integration, asset tracking, knowledge base, file attachments and more.

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

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.

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.