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

Trelby - The free, multiplatform, feature-rich screenwriting program!

Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫