If you want to add chat room in your website or blog, Talkinator is a free web service that will help you to add chat room on your website. No download and sign up is required for using Talkinator.
To create chat first got to Talkinator website copy code from Talkinator website and paste into your website where you want. You can change chatroom settings like width, height, color, words etc. You can add password and make your chat room for members only.