: Apps like All Document Reader that let you view and organize PDF, Word, and Excel files.

: Software such as Exam Paper Pro for creating test papers or Papers for managing research citations.

The phrase "" (download everything for free) is a broad request, and the addition of " complete paper " makes it a bit ambiguous as it could refer to several different types of software.

: Apps like °m E-Paper for reading digital newspaper editions.

: Tools like Paper by WeTransfer for sketching or Draft Paper for floor plans and blueprints.