A very gentle introduction to the terminal and working with shell environments for researchers.

An interesting approach using sql database to store tasks and retrieve them with all kinds of tools

Assist in organizing your piles of documents, resulting from scanners, e-mails and other sources with miminal effort. - eikek/docspell

Mirrors paperless, but comes with more features regarding ocr (NLP, a learning engine, auto-tagging etc), saves the originals and the pdf versions, can send e-mail, has a much more advanced web interface -- but also consumes more resources.