Nisus Writer, originally Nisus, is a word processing program for the Apple Macintosh. The program is available in two varieties: Nisus Writer Express, and Nisus Writer Pro. First introduced in 1989, the Nisus Writer was the first word processor for Macintosh—long before Unicode was introduced—which was able to handle multiple type systems within one document, e.g. Arabic, Hebrew, Japanese, etc., thanks to WorldScript. Therefore Nisus Writer was an indispensable tool for people who had to integrate passages written in non-Roman script into a regular document, for instance theologians and archaeologists.