GoldenDict-ng - https://github.com/xiaoyifang/goldendict-ng/releases

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Dictionaries for GoldenDictЖ
https://rutracker.org/forum/viewtopic.php?t=3582459
https://cloud.freemdict.com/index.php/s/pgKcDcbSDTCzXCs
http://dadako.narod.ru/paperpoe.htm

Dictionaries I recommend

Collins Cobuild

Webster's Third New International Dictionary

American Heritage Dictionary

Oxford Advanced Learner's Dictionary

Oxford English Dictionary

Oxford Dictionary of Quotations

Random House Webster's Unabridged Dictionary

GNU dictionary

Johnson's dictionary

Wordnet

Encyclopedias I recommend

Columbia Encyclopedia

Britannica 2010 - RuTracker

1911 Britannica

Stanford Encyclopedia of Philosophy

How to create dictionaries for GoldenDict:
http://languagehopper.blogspot.com/2013/06/how-to-make-your-own-stardictoldendict.html
https://code.google.com/archive/p/stardict-3/downloads

Google Translate - https://translate.google.com/

Online dictionaries:

Multitran - https://www.multitran.com/

Collins COBUILD - https://www.collinsdictionary.com/

Oxford English Dictionary - https://www-oed-com.i.ezproxy.nypl.org/

Random House Unabridged Dictionary - https://www.dictionary.com/

Free Dictionary. Idioms and phrases - https://idioms.thefreedictionary.com/

Visual Dictionary - http://www.visualdictionaryonline.com/

Encyclopedias:

Oxford Reference - https://www-oxfordreference-com.i.ezproxy.nypl.org/

Encyclopedia.com - https://www.encyclopedia.com/

Encyclopaedia Britannica:
https://rutracker.org/forum/viewtopic.php?t=4891866
https://rutracker.org/forum/viewtopic.php?t=6307320
https://rutracker.org/forum/viewtopic.php?t=6304689
https://www.britannica.com/
https://academic.eb.com/levels/collegiate
https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica

Encyclopedia Americana - https://rutracker.org/forum/viewtopic.php?t=6311493

Columbia Encyclopedia - https://www.infoplease.com/encyclopedia

Stanford Encyclopedia of Philosophy - https://plato.stanford.edu/index.html

Internet Encyclopedia of Philosophy - https://iep.utm.edu/metaethi/

Encyclopedia of Philosophy - https://www.myanonamouse.net/t/80064

Encyclopedia of Diderot and D’Alambert - https://quod.lib.umich.edu/d/did/title/A.html

Encyclopedia.com - https://www.encyclopedia.com/

World History - https://www.worldhistory.org/

Larousse - https://www.larousse.fr/encyclopedie

Treccani - https://www.treccani.it/

Our World in Data - https://ourworldindata.org/

Statista - https://www-statista-com.i.ezproxy.nypl.org/

Fun command-line dictionary

Some StarDict dictionaries are hyphenated. They are not very convenient for GoldenDict, but they are great for Windows command-line.

To run StarDict dictionary in command-line

1) install sdcv:

MSYS - https://www.msys2.org/

pacman -S mingw-w64-sdcv

2) create system variable:
STARDICT_DATA_DIR
C:\msys64\mingw64\bin\dict

3) put stardict-dictd-web1913-2.4.2 into dict folder

4) add sdcv to PATH

Then:
Win+R cmd
sdcv

You can make .bat file:
C:\msys64\mingw64\bin\sdcv.exe