Yes. [Celtx](http://celtx.com/) contains a screenwriting component, as does [Five Sprockets](http://www.fivesprockets.com/fs-portal/).
In addition, some pay programs offer free demo versions with limitations, like a limited trial period or watermarked printing, for example.
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* [Celtx screenwriting application shows promise](http://johnaugust.com/2005/celtx-screenwriting-application-shows-promise “Celtx screenwriting application shows promise”)
* [Screenwriting software survey results are in](http://johnaugust.com/2004/screenwriting-software-survey-results-are-in “Screenwriting software survey results are in”)
* [The Hollywood Standard](http://johnaugust.com/2007/hollywood-standard “The Hollywood Standard”)
* [Script formatting](http://johnaugust.com/2003/script-formatting “Script Formatting”)
* [What format should I send my script in?](http://johnaugust.com/2005/what-format-should-i-send-my-script-in “What format should I send my script in?”)