CygnusEd Perhaps the best known Amiga text editor; multiple views (split screen), ARexx integration. Commercial
EdWord Professional Public domain editor (GFA Basic) w/syntax highlighting, split screen and ARexx integration
NoWinEd MUI based text editor. Open Source. On Aminet.
Annotate Cross platform (AOS3,AOS4, MorphOS 1 and AROS) programmers editor with macros and syntax highlighting. GPL
FrexxEd Programmers editor with powerful built in scripting language,ARexx integration, syntax highlighting. Open source (C). On Aminet
Emacs - Multiple versions on Aminet. Complicated setup. TODO: Describe install process, which includes picking multiple archives and setting up an assign for GeekGadgets.
Vi/Vim
IDEs
CubicIDE IDE for AmigaOS3 and MorphOS, complete with integrated support for a number of compilers.