BITD I used Protext word processor on Atari ST (and later DOS/Windows PC) which automatically justified monospace text. It also had a pretty good dictionary (all in 512KB of RAM) and I remember doing this word dance to get lines to flow better.

Manual: https://www.atarimania.com/st/files/protext_5_04_arnor.pdf

Screenshot of manual section: https://jumpshare.com/share/jOnMu7M36AOEWyoL0QDl