I want to use a new class in LyX. I know where to save the .cls file so that LyX can use it. I have already done that. I also know that I need a layout file and need to save it in the layout folders. My problem is that I do not know which software to use to write the layout file. Any answers?
.layout file is just a plain text file, so use any plain text editor. E.g. Notepad, Gedit, Kate, Textedit, Notepad++, Sublime Text, Atom, Vim, Emacs etc. Whichever you prefer.