DeskTop Author
Desktop Author is an electronic publishing software that allows you to create 3d page turning digital web books. Digital web books are any type of e-publication including e-brochures, e-books, digital photo albums, e-cards, digital diaries, online resumes, quizzes, exams, tests, forms and surveys. ... Upon reaching the end of the free page section the end user is prompted to pay for the rest of the eBook, once payment is made through the payment gateway the rest of the eBook is unlocked and the end user is free to view the rest of the eBook on their own PC.
http://www.desktopauthor.com/download/dtaeval.exe - 16Kb - Download - Screenshot