MS Word, for Outline Mode alone. I prefer Word 2003 or failing that Word 97, which is the oldest, smallest, fastest version that handles the same file formats

MS Word, for Outline Mode alone. I prefer Word 2003 or failing that Word 97, which is the oldest, smallest, fastest version that handles the same file formats used everywhere until MS invented its compressed-XML nonsense. Word '03 started working around WINE 8 or so. Before that, I had to use Crossover for it.