Dictionaries: English
- Merriam-Webster Dictionary
- Collins Online Dictionary
- Cambridge Dictionary
- OED
- Etymology Dictionary
- The Visual Thesaurus
- Dictionary of the English Language
- WordNet *
- Princeton University
- yourDictionary.com
Dictionaries: Translation
- Google Translate
- French-English: Collins
- French-English: Larousse
- German-English: Collins
- Italian-English: Collins
- Italian-English: WordReference
- Spanish-English
- WordReference.com
Encyclopedias
- Encyclopedia Britannica *
- Literary Encyclopedia
- Stanford Encyclopedia of Philosophy
- Wikipedia
- Wikitia
- An Encyclopedia by Verified Editors
Libraries
- ACM Digital Library
- Answers.com
- Bartleby.com
- Great books online
- LibraryThing
- Catalog your books online
- New York Public Library
- Open Library
- Urbana Free Library
Maps
Medical Reference
- Ask Dr. Weil
- Andrew Weil, M.D.
- Go Ask Alice!
- Columbia University
- Linus Pauling Institute
- Oregon State University
- MedlinePlus *
- Medical Encyclopedia
Miscellaneous
- BestPlaces.net
- Catalog Choice
- Democracy.io
- Earth-Sun Geometry
- PhysicalGeography.net
- Geni – Genealogy
- HubbleSite
- M-Lab
- Mechanical Watch
- Bartosz Ciechanowski
- Official NIST U.S. Time
- Open Culture
- Free books, lectures, courses, et al.
- Speedtest.net
- TVM Calculators
- Tutorials, HP 12C
- U.S. Copyright Office
- U.S. Founding Documents
- National Archives
- UTC Time Zone Converter
- Web Palladium Calculator
- Based on HP 12C
Nations Online Project
- Countries and Regions of the World from A to Z
- Political Map of Europe
- Political Map of Central and Eastern Europe
Online Courses
- Academic Earth
- Coursera *
- Stanford et al.
- Duolingo
- The Elements of Drawing
- John Ruskin’s teaching at Oxford
- edX
- Free Online Courses by Harvard & MIT
- MIT OpenCourseWare
- Open Learning Initiative
- Carnegie Mellon University
- Open Yale Courses
- Udacity
- WMAP's Introduction to Cosmology
Phone & Zip Code Directories
- Melissa Lookups
- Address Check and Verification
- Whitepages
- ZIP Code Lookup
- USPS