Programming Addition To Website

Hello.

We are in the final stages of a book authors website. We need an addon that relates to him live writing and for followers to view.

What I need is an addon to a joomla site ( either standalone or a an outside link )that allows an administrator ( author )to type what he wants for his novel. The customer can then login ( at a specified time ) to see what he’s typing, (even with a little delay), but seeing what the author types on screen

There needs to be a function where he can then archive the chapter, but if he feels like going back and editing it, he can.

Also, a timer for him to countdown when his next session is will be helpful.