Free: Serif PagePlus desktop publishing software It's the Starter Edition, meaning some features are disabled, but it still packs more than enough power for creating newsletters, flyers, and the like.

Scribus is a free alternative to Microsoft Publisher. This desktop publishing software for Windows will help you write books, magazines, newsletters, articles, PDF, etc.

You can convert PUB files to PDF using the Microsoft Publisher software itself or use the free online Publisher to PDF converter tool.