Reference
Free reference — 14 tools · 14 tools
Encyclopaedia Britannica
One of the oldest and most respected general knowledge encyclopedias online
Zotero Bib
Generate citations and bibliographies quickly
Dictionary com
English dictionary, thesaurus, and word tools
Startpage
Private search engine with Google results
Etymonline
Online etymology dictionary for word origins
Google Scholar
Free web search for scholarly literature including articles, theses, and citations
Merriam-Webster
America's most-trusted dictionary and thesaurus
Open Library
Open, editable library catalog with millions of free ebooks and lending
Project Gutenberg
Free digital library of over 70,000 public-domain ebooks with downloads
Pub Med
Free database of biomedical literature from MEDLINE and life science journals
Thesaurus com
Find synonyms and antonyms instantly
Wikipedia
The free encyclopedia anyone can edit
Wolfram Alpha Reference
Compute answers using a vast knowledge base
World Cat
Global catalog of library collections for finding books, media, and archives