Notepad ++ supports syntax highlighting, syntax folding, if you feel inclined or tempted you can create the highlighting for your own language, it will print out a coloured version of your file, auto completion speeds up the typing. Notepad++ allows you to edit multiple documents at the same time in tabs, view them dynamically and even zoom the view, search and replace, also with regular expressions, bookmark the lines of your document, and last but not least record macros.

Using Notepad++ means your plain text editing problems have found their final solution. For us it is simply the best free text editor available