Anna's Archive - Massive Free Online Library Useful particularly for finding free versions of academic books. But also, Anna's archive includes everything from comics and childrens books, to smut, religious documents, and cook books.
*https://annas-archive.org/*
Archive Links [Extention that lets you archive webpages before they are taken down.](https://addons.mozilla.org/en-US/firefox/addon/archive-page/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search)
Internet Archive - Massive Free Online Library Including Non-Written Sources [A free library of digitized documents](https://archive.org/)
Way Back Machine - Archive of web pages [Useful for reasearch of the internet.](https://archive.org/)
Zotero - Citation Managment Software [Zotero is a useful orginizational tool that has allowed me to build a library of citations and linked documents. It automatically formats bibliographies for me in Chicago. Because of Zotero, my reasearch is signifigantly more orginized.](https://www.zotero.org/)