WriterSolo VS Celtx

Story Architect (STARC) - STARC - A smooth yet powerful screenwriting experience for devoted authors. With only wanted features and simple workflow it runs faster than all your previous apps combined.

Scrivener - Scrivener is a content-generation tool for composing and structuring documents.

Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.

WriterDuet - Collaborative screenwriting for everyone* *Great for solo writers as well!

yWriter - Free writing software designed by the author of the Hal Spacejock and Hal Junior series. yWriter6 helps you write a book by organising chapters, scenes, characters and locations in an easy-to-use interface.

Slugline - Slugline gives back the screenwriter to a more established, more straightforward time when the words on the page started things out and last.