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Note that while I've tried my best to ensure I'm not linking to anything low quality/weird, I cannot vouch for the quality of any educational resources linked below.
Books
| Standard eBooks | Nicely formatted public domain books |
| Queer Liberation Library | Libby library that's open to anyone in the USA |
| Japan Foundation Library | Libby library that's open to anyone in the USA |
| Recommend Me a Book | Shows you a brief preview of a book, only revealing which book it is when you click a button. |
| Unglue It | |
| Digital Book Index | |
| Libgen | Wikipedia link used as working addresses change frequently |
| Anna's Archive | Wikipedia link used as working addresses change frequently |
Dictionaries & Related
Sort of loosely sorted from en-en to ja-en to ja-ja, but many resources have a variety of language offered which will probably muddle it
| One Look | Searches hundreds of E-E dictionaries at once. The search function is insanely powerful making this site really useful for word games |
| Stardict Dictionaries | A bit difficult to navigate but covers a bunch of different languages and language pairs |
| Wordnik | dictionary used by a lot of online word games |
| MDict Dictionaries for Goldendict | Extremely large collection of basically every possible language pair including monolinguals |
| 英辞郎 on the WEB | J-E dictionary aimed at JP speakers |
| The Jaded Network | J-E Sound effects. The site is disintegrating, but it's still usable |
| WWWJDIC | The default J-E dictionary is the usual one you see in these resources, but there's several other dictionaries included |
| EPWing Dictionaries | |
| MDX Dictionaries | |
| Yomitan Dictionaries | |
| Yomitan Dictionaries | (Different Link) |
| Yomitan Dictionaries | (Different Link) |
| J-J Dicts Proton Drive | Several J-J dictionaries |
| 伏字検索○○○ | Helps decipher censored words |
Search Engines
| Springer Nature Link | Scientific research |
| Refseek | Academic references |
| Marginalia | Tries to surface non-commercial sites |
| Wiby | Searches a pool of curated sites rather than crawling |
| Bielefeld Academic Search Engine | Academic research |
| Worldcat | Searches library catalogs. Probably USA only? |
| Impersonal | Google search but with a fake personalization profile |
| Search Engines With Their Own Indexes | Overview of what search engines exist for general purpose usage |
| Ao3 Search Operators Cheatsheet | List of search operators that Ao3 has that you might not know about |
Textbooks
| Openstax | |
| IT eBooka | |
| Free Programming Books | |
| Directory of Open Access Books | |
| You Don't Know JS |
other
| The Eye | Large archive of primarily documents iirc. Currently down due to technical difficulties, but they've recovered in the past so I'm still linking them |
| The Old Farmer's Almanac | It's available digitally, I guess |
| Textfiles.com | Internet history via archived text files |
| Remove Paywall |