Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Apple iWork - iWork is an office suite by Apple.
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
OnlyOffice Docs - OnlyOffice Docs is an effective document creation and editing platform that provides you the options to create any kind of document with the collaboration of your team from any remote location.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Airborn - Create and edit documents online without sacrificing your privacy