LiveAgent

LiveAgent is a multi-channel, web-based helpdesk software (Supports Email, Voice, Live Chat, Twitter and Facebook). All important help desk and live chat features included: POP3 accounts, Email piping, Departments, Priorities, Statuses, Tags, Rules, Ticket Routing, Canned/Predefined messages, Email templates, Voice integration, Real-time website monitoring and statistic, Chats, Facebook integration, Knowledgebase, Live Suggestions as you type, Feedback and Contact forms, Agent rating, Gamification, Multilingual, Ticket Filters, File sharing and attachments, Chat button templates and much more. All features are fully customizable, no HTML coding is required.

Limitations:

14-day trial (all features are included, no credit card required)