Script it!
Word processor specifically for screenplays.
9 Alternatives To Script it!
Arc Studio Pro
Screenwriting just became easier
Celtx
Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Fade In
Fade In Professional Screenwriting Software is a complete application for writing motion picture…
Final Draft
Use your creative energy to focus on the content; let Final Draft take care of the style.
Highland
*** 2013 Macworld Eddy Winner! - Best of 2013 ***
KIT Scenarist
Simple and powerful application for writing screenplays.
Slugline
Slugline gives back the screenwriter to a more established, more straightforward time when the words on the page started things out and last.
Trelby
The free, multiplatform, feature-rich screenwriting program!
WriterDuet
Collaborative screenwriting for everyone* *Great for solo writers as well!