Here are a few useful layout templates for editorial design with source files. They come in a nice organized INDD format (Adobe InDesign), and includes templates for text-only pages, text with images, heading and more. The file also has an editable cover page.
The design is free to download and use, and it was created by Chandesh Tk.
InDesign Editorial Layouts http://www.bypeople.com/indesign-editorial-layouts/