Products that can be delivered in digital form. Most famous examples are Software, eBooks and Music. A more complete list:
Websites, Mobile Apps, Desktop software, Server software, Ebooks, Audio books, Songs, Courses/tutorials, Courseware, Webinar/conferences, Spreadsheet, Plugin/Extension, Templates/themes, Example letters (templates), Legal documents, 3D Model patterns, Craft patterns, Photographs, Illustrations, Films, Articles, Games, Printables, Data and Recipes.
My book "Choose Your First Product" is available now.
It gives you 4 easy steps to find and validate a humble product idea.