While we don’t advocate any single approach, we do like to discuss tools and promote those that are frequently used. Celtx is a site with a variety of pre-production tools and resources, ranging from free scriptwriting to premium storyboarding and insight features. It allows online scriptwriting in several formats and maintains options for group collaboration with additional elements such as storyboarding, and script continuity.
This application is similar in function to Final Draft, or similar script-writing software. The free version allows you to use the word processor while other features and tools are made available upon starting a subscription with Celtx.
Visit their website here: https://www.celtx.com/