Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
DocGen - Static website generator
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
openSourceCM - Web-based legal document processing and contract management
Trelby - The free, multiplatform, feature-rich screenwriting program!
LogicalDOC - A document management system such as LogicalDOC can help your organization better manage business processes and put order in the chaos of documents every day run your business.