Scrivener, Final Draft, Celtx, yWriter, Manuskript, Fortelling - Writer Tools, Story Plotter, Amazon Storywriter, Scriptware, Story Architect (STARC), Campfire Write, CopyWrite, Arc Studio Pro, Highland, Slugline, Plotbot, WriterDuet, Adobe Story, Page 2 Stage, Practical Scriptwriter, Script it! are some alternatives to Trelby.