Language/Multiple-languages/Culture/Licensed-Free-Databases
The listed are databases, not applications. That is to say, if you don't know programming, maybe they won't help you.
Multiple languages
https://unicode.org/ucd/
License address: https://www.unicode.org/copyright.html
Some of its users: Gucharmap, decodeunicode
Unicode.
https://dumps.wikimedia.org/
License address: https://dumps.wikimedia.org/legal.html
Some of its users: Wikimedia
Wikimedia.
https://panlex.org/source-list/
Lexical database links.
https://tatoeba.org/eng/downloads/
License address: https://tatoeba.org/eng/downloads/
Some of its users: ListeningPractice.org, Jisho.org
Parallel corpora. In common words, a sentence in different languages.
http://www.dicto.org.ru/xdxf.html
License address: http://dicto.org.ru/license.html
Some of its users: Dicto
Dictionaries.
http://compling.hss.ntu.edu.sg/omw/
License address: http://compling.hss.ntu.edu.sg/omw/
Dictionaries.
http://www.omegawiki.org/Help:Downloading_the_data
License address: http://www.omegawiki.org/Meta:Main_Page
Dictionaries.
= https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists
License address: https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists
Frequency lists.
Japanese
http://edrdg.org/jmdict/j_jmdict.html
License address: https://www.edrdg.org/edrdg/licence.html
Some of its users: Jisho.org, Tagaini Jisho
Japanese Dictionary in many languages.
http://kanjivg.tagaini.net/
License address: http://kanjivg.tagaini.net/
Some of its users: Tagaini Jisho, Jisho.org
Kanji strokes.
Chinese
http://resources.publicense.moe.edu.tw/dict_reviseddict_download.html
License address: http://resources.publicense.moe.edu.tw/dict_reviseddict_download.html
Some of its users: 萌典
Dictionary of ROC Mandarin Chinese written in ROC Mandarin Chinese.
https://cc-cedict.org/editor/editor.php
License address: https://cc-cedict.org/wiki/
Some of its users: MDBG, Pleco
Mandarin-English dictionary.
https://chine.in/mandarin/dictionnaire/CFDICT/
License address: https://chine.in/mandarin/dictionnaire/CFDICT/
Some of its users: Chine Informations, Pleco
Mandarin-French dictionary.
http://www.handedict.de/chinesisch_deutsch.php
License address: http://www.handedict.de/chinesisch_deutsch.php?mode=dl&sid=51394be2b6d9cba75946e929b5477d55
Some of its users: HanDeDict, Pleco
Mandarin-German dictionary.
https://chdict.zydeo.net/en/download
License address: https://chdict.zydeo.net/en/download
Some of its users:CHDICT
Mandarin-Hungarian dictionary.
http://cantonese.org/download.html
License address: http://cantonese.org/download.html
Some of its users: CC-Canto
Cantonese-English dictionary.
http://www.taiwanesedictionary.org/
License address: http://www.taiwanesedictionary.org/
Taiwanese-English dictionary.
http://lingua.mtsu.edu/chinese-computing/
License address: http://lingua.mtsu.edu/chinese-computing/copyright.html
Frequency lists.
http://technology.chtsai.org/charfreq/
License address:
Frequency and stroke counts in ROC.
Vietnamese
http://www.informatik.uni-leipzig.de/~duc/Dict/install.html
License address: http://www.informatik.uni-leipzig.de/~duc/Dict/install.html
Some of its users: TuDienHND
Dictionaries in several languages: English, Vietnamese, French, German, Norwegian.
There is a page of introduction: https://vi.wiktionary.org/wiki/Wiktionary:Ngu%E1%BB%93n_g%E1%BB%91c/FVDP