This simple (yet very effective) tool allows you to add documents, move the documents (to organize them), search them (by title or even within the body), export them, add keywords and labels to documents, view document properties, search by keyword(s), and change the document view. //

The Paperwork feature list includes scanner support, PDF support, auto-detection of page orientation, OCR, document labels, auto-guessing of labels to apply to new documents, search, keyword suggestions, and quick scan edits.

Paperwork is free and can be installed on any Linux distribution and even Windows.