Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Tyke - Mac menu bar app that @torrez really needed to take notes
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫