Notepad++ works well, and is free. You can get gVim (vi editor) if you are old school. You could try Atom, too, it's what the cool kids use nowadays. Also Eclipse. and then there is the WUDSN project here:https://www.wudsn.co...de/installation
Err, WUDSN is Atari, not user if it has support for TI stuff.