Allmost all editors are capable of connecting to maya easiest approach is to get a have a commandline application that can dump things into socket communication which are freely downloadable to all known systems even most mobile phones. (yes I can and have tested connecting my phobe to maya took 4 minutes to set up). however you can bolt things even tighter if you want
So faar i have used.
scite (melstudio pro is just a scite connected to maya vie the api)
vi
emacs
xemacs
notepad++
crimson editor
netbeans
eclipse
visual studio
ammendum: oh, allmost forgot jedit and firefox (yeah you can use it as a editor, as abonus it knows how to talk over sockets)
atleast eclipse and scite have instructions and downloads in the donwload section.