Go for Live2Support. Its one of the best chat software at the lowest price. Its free for 15 days then pay $9.99/Month. 24/7 customer support.
These are the most recommended features of Live2support:
Realtime Visitor Monitoring
* Monitor Website Traffic in Real-time.
* Fast and Easy Navigation.
* Block IP Address.
* Send a pop-up window of special offer or change visitor current page with some special page.
* Chat invitation : Auto/Proactive chat invitation, Page Specific Chat Invitation, floating/jumping and in page chat window, Layered Chat Window
* Extensive Visitor Information System. (Geo location, search engine, time spent etc.)
* Chat History of every visitor comes to your website.
* Web Base Interface for monitoring and chatting.
* Stand Alone Application ( Windows, Mac, iPhone, iPad) for monitoring and chatting.
* Foot Prints (How many page visited and time spent by visitor on each page.)
* Call Back & Call Back History.
Chatting with your visitor:
* One to One Text Chat with WebSite Visitors.
* One Support Operator can Accept Multiple Chat Request.
* No Visitor Log-in or Sign-up Required.
* Chat History Pop-up on Initiating Chat.
* Serving Web Pages to Online Customers.
* Pre-written or Standardized Responses.
* Smilies (Emoticons) during chat.
* File Transfer during chat.
* Co-Browsing during chat session.
* Customize Pre & Post Chat form.
* Leave Message form (if support operators offline).
* Multiple Support Operators Sharing Chat Session.
* Typing Status Alerts.
Look & Feel Customization:
* Fully Customizable Visitor Chat Windows (To match with your web site look & feel).
* Ready Made Chat Windows Templates.
* Customizable Offline Message Form.
* Show visitor position in Chat Queue.
* Customizable Online and Offline Graphics.
* Graphics Customization at the Departmental and Page Level.
* Visitor Window Language Customization. (Chat window in multiple languages).
* Language Support in Email Messaging.
Preferences & Setting Control:
* Fast and Easy Integration.
* Live Support Through more than One Department.
* Department Based Chat Session.
* Show visitor Queue Number in chat waiting status.
* Maximum waiting time by visitor in queue.
* Language Customization.
* Enable time base chat session.
* Operators auto log out from application.
* Auto Greeting Message on chat pick for every operator.
Supervising & Reporting:
* Administrative and Moderator Privileges.
* Administrator Chat Monitoring and Live Support.
* PPC Tracking and Hits Reporting.
* Complete Visitor Statistics Log (Application keeps track of visitors even if all support operators are off-line.
* Chat Transcripts of All Chat Sessions, search, email etc.
* Chat Sharing, Chat Transfer and Messaging to another Support Operator.
* Administrator/Supervisor Monitoring of Running Chat Session and Participation.
* Operator Assessment/ Performance Reports and Time Logs of Live Support Service.
* Google Analytics Integration.
Value Added Features:
* Local Time Integration.
* Pass Custom Variables form Your Web Pages.
* Post Chat Survey.
* SSL-based Tracking and Chat Codes to Secure Pages and Chat Sessions.
* Pro-Popup or Change Visitor Page without chat.
* Third Party Integration.
* Chat Routing.
* Gtalk integration for smart support.
* CRM integration (Sales force and Sugar CRM).
* Plug-ins for CMS, E-commerce and Blogging Platforms.
* Sticky Notes, To-do List, Calender.
* Spell Checker (8 Languages).