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from celtx.com:

Celtx is the world's first all-in-one media pre-production software. It has everything you need to take your story from concept to production. Celtx replaces 'paper, pen & binder' pre-production with a digital approach that's more complete, simpler to work with, and easier to share.

*Multi-Media Friendly*
Celtx helps you pre-produce all types of media - film, video, documentary,
theater, machinima, comics, advertising, video games, music video, radio,
podcasts, videocasts, and however else you choose to tell your story.

*All In One*
Unlike scriptwriting software and sites, you can use Celtx for the entire
pre-production process - write scripts, storyboard scenes and sequences,
develop characters, breakdown & tag elements, schedule production, and prepare
detailed and informative production reports for cast and crew.

*Fully Integrated*
Celtx is designed to help your entire production team work together on a
single, easy to share project file - eliminating the confusion of multiple
project files, and the need for 'paper and binder'.

*World Community of Media Creators*
More than 500,000 media creators in 160 countries create with Celtx in 28
different languages. Celtx is used by independent filmmakers and studio
professionals, and by students in over 1,800 universities and film schools -
many that have adopted Celtx for teaching and class work submission.

*The Best of The Desktop & The Web*
Celtx is a desktop application that delivers the most fluid writing and
editing experience. You can always keep your fingers moving as fast as your
thoughts and your creative flow is never interrupted. With Celtx you can also
work at any time off-line and privacy is never a concern.

Celtx Studios use the web to deliver a central server's superior strength for heavy-lifting tasks such as mass storage, collaboration and e-commerce.

No other film production software gives you the advantages of the Celtx-Celtx Studios hybrid desktop-web architecture.

*Non-Linear Project Development*
Unlike scriptwriting software and sites, Celtx puts a choice of fully
integrated development tools right at your fingertips, giving you total
flexibility to determine how your story takes shape.