I have created a website on drupal platform for promoting my real estate business. Now I need a live chat plugin for that to handle queries of my clients.

For drupal platform there are many live chat plugins available such as eAssistance Pro, zopim etc. You can try anyone. As per my personal experience I refer eAssistance Pro for you because it is a very user friendly.

Hello chriscolfer,
Have you find the drupal platform or promoting your real estate business ?

I know a very good Drupal platform,

http://www.123flashchat.com/drupal-chat.html

http://drupal.123flashchat.com/

Seems like they got really good review for webmasters or users. So that why don't you try it?

Our website use this plugin almost 2 years, I have to say, it's quite compatible with our website.