Macs have been the writer’s computer of choice since the 1980s, and as a result there are probably more text editors and word processing apps for macOS than any other operating system. However, most of those tools don’t have what it takes to do really serious writing on the Mac. Take for instance, writing research papers with complex mathematical functions and copious references, or writing a book with extensive cross-references, footnotes, many chapters and subsections. The only word processor that can handle it all is Mellel, this week’s sponsor of Apple World Today.