Hello. I have developed a usable Chapel syntax highlighting for the Geany Editor
(http://geany.org). I myself use emacs and am quite happy with chapel-mode, but it appears that geany is quite popular among my grad students. Moreover, it runs in Linux, Windows and MacOS, so maybe this will be useful for a larger group of people wanting to try Chapel but not willing to face emacs or vi. You can find the README instructions and the two files needed in http://nldias.github.io/software.html.