Celtx Alternatives, Similar

Based on the Firefox engine, supports standards, visual storyboarding, production scheduling, publication & international languages MUI support. Free tutorials, videos & wiki are available from the site. There is a very helpful community too.Portable versions:
jacob-koehler.de/projekte/portable-celtx/en/
freesmug.org/portableapps:celtx
portableapps.com/node/20566Screenwriting
Celtx uses an industry standard screenwriting editor typical for screenplays, stageplays, AV scripts, comic books or radio plays. Celtx also includes a rich text editor for outlines. Celtx also incorporates LaTeX in its Typeset feature which allows for more flexible templates & printing options.
Project collaboration, management & storage
Celtx offers a web service called Celtx Studios for advanced project collaboration & online file storage…. More Info »Publishing
Scripts can be uploaded to the Celtx Forum for public viewing, peer reviews & commentary.Scheduling
Celtx utilizes the open source Mozilla Sunbird to handle calendaring & production scheduling.Elements
Celtx features thirty-five different elements, such as Actor or Special Effects, that can be added to the project. These elements can have various information added to them, such as media or text. Celtx allows directors & writers to easily tag elements within each script. These tagged elements can then be automatically transferred to a script breakdown which allows production staffers to easily know what elements the script calls for.Pre-Visualization ToolsStoryboarding
Celtx allows people to create storyboard sequences, which can be printed or played using Celtx's built-in image viewer. These are also available to view on a project's website & can be played inside the browser.Sketch Tool
The Sketch tool can be used to draw a sketch or setup which can also be added to your storyboard. The Sketch tool includes pre-loaded icons for cameras, lights & people that can be tagged with text & tools for drawing lines, arrows, shapes & text.