Trying to answer myself with some cleaning. So, which existing or
potential Wikisources lack OCR with FineReader (and Tesseract?) but are
interested in Google's, beyond Bengali?
== Languages supported by FineReader, not Google ==
Abkhaz
Adyghe
Agul
Altaic
Avar
Blackfoot
Bugotu
Buryat
Chamorro
Chukchee
Corsican
Crow
Dargwa
Dungan
Dutch (Belgium)
Eskimo (Cyrillic, Latin)
Even
Evenki
Frisian
Friulian
Gagauz
German (Luxemburg)
German (old spelling)
Hani
Ido
Ingush
Interlingua
Jingpo
Kabardian
Kalmyk
Karachay-balkar
Kasub
Kawa
Khakass
Khanty
Korean (Hangul)
Koryak
Kpelle
Kumyk
Kurdish
Lak
Lezgi
Luba
Malinke
Mansi
Mari
Maya
Miao
Moldavian
Mordvin
Nenets
Nivkh
Nogay
Norwegian (Nynorsk)
Occidental
Ojibway
Ossetian
Provencal
Rhaeto-romanic
Rwanda
Sami (Lappish)
Selkup
Somali
Sorbian
Sotho
Sunda
Tabasaran
Tagalog
Tok Pisin
Tun
Turkmen (Latin)
Tuvinian
Udmurt
Uighur (Cyrillic, Latin)
Ukrainian
Yakut
== Languages supported by Google, not FineReader ==
Acehnese
Acholi
Adangme
Akan
Algonquinian
Amharic
Ancient Greek
Araucanian/Mapuche
Assamese
Asturian
Athabaskan
Balinese
Bambara
Bantu
Batak
Bengali
Bikol
Bislama
Bosnian
Burmese
Cherokee
Chinese (Mandarin; Hong Kong)
Choctaw
Cree
Creek
Dhivehi
Duala
Dzonkha
Efik
Ewe
Filipino
Fon
Fulah
Ga
Gayo
Georgian
Gilbertese
Gothic
Gujarati
Haitian Creole
Herero
Hiligaynon
Hindi
Iban
Igbo
Iloko
Javanese
Kabyle
Kachin
Kalaallisut
Kamba
Kannada
Kanuri
Khasi
Khmer
Kinyarwanda
Komi
Kosraean
Kuanyama
Lao
Lingala
Low German
Lozi
Luba-Katanga
Luo
Madurese
Malayalam
Mandingo
Manx
Marathi
Marshallese
Mende
Middle English
Middle High German
Mongo
Navajo
Ndonga
Nepali
Niuean
Northern Sotho
North Ndebele
Nyankole
Nyasa Tonga
Nzima
Ojibwa
Old English
Old French
Old High German
Old Norse
Old Provencal
Oriya
Ossetic
Pampanga
Pangasinan
Pashto
Persian
Punjabi (Gurmukhi)
Romansh
Sakha
Sango
Sanskrit
Scots
Sinhala
Songhai
Southern Sotho
Sundanese
Tamil
Telugu
Temne
Tibetan
Tigirinya
Tsonga
Udmurt Ukrainian
Urdu
Venda
Votic
Western Frisian
Yoruba
Abkhaz
Adyghe
Afrikaans
Agul
Albanian
Altaic
Arabic
Armenian
Avar
Aymara
Azerbaijani
Azerbaijani (Cyrillic; old orthography)
Bashkir
Basque
Belarusian
Bemba
Blackfoot
Breton
Bugotu
Bulgarian
Buryat
Catalan
Cebuano
Chamorro
Chechen
Chinese (Simplified; Mandarin)
Chinese (Traditional; Mandarin)
Chukchee
Chuvash
Corsican
Crimean Tatar
Croatian
Crow
Czech
Dakota
Danish
Dargwa
Dungan
Dutch
Dutch (Belgium)
English
Eskimo (Cyrillic, Latin)
Esperanto
Estonian
Even
Evenki
Faroese
Fijian
Finnish
French
Frisian
Friulian
Gagauz
Galician
Ganda
German
German (Luxemburg)
German (old spelling)
Greek
Guarani
Hani
Hausa
Hawaiian
Hebrew
Hungarian
Icelandic
Ido
Indonesian
Ingush
Interlingua
Irish
Italian
Japanese
Jingpo
Kabardian
Kalmyk
Karachay-balkar
Karakalpak
Kasub
Kawa
Kazakh
Khakass
Khanty
Kikuyu
Kirghiz
Kongo
Korean
Korean (Hangul)
Koryak
Kpelle
Kumyk
Kurdish
Lak
Latin
Latvian
Lezgi
Lithuanian
Luba
Macedonian
Malagasy
Malay
Malinke
Maltese
Mansi
Maori
Mari
Maya
Miao
Minangkabau
Mohawk
Moldavian
Mongol
Mordvin
Nahuatl
Nenets
Nivkh
Nogay
Norwegian (Bokmål)
Norwegian (Nynorsk)
Nyanja
Occidental
Occitan
Ojibway
Ossetian
Papiamento
Polish
Portuguese (Brazil)
Portuguese (Portugal)
Provencal
Quechua
Rhaeto-romanic
Romanian
Romany
Rundi
Russian
Russian (old spelling)
Rwanda
Sami (Lappish)
Samoan
Scottish Gaelic
Selkup
Serbian (Cyrillic)
Serbian (Latin)
Shona
Slovak
Slovenian
Somali
Sorbian
Sotho
Spanish
Sunda
Swahili
Swazi
Swedish
Tabasaran
Tagalog
Tahitian
Tajik
Tatar
Thai
Tok Pisin
Tongan
Tswana
Tun
Turkish
Turkmen (Cyrillic)
Turkmen (Latin)
Tuvinian
Udmurt
Uighur (Cyrillic, Latin)
Ukrainian
Uzbek
Uzbek (Cyrillic)
Vietnamese
Welsh
Wolof
Xhosa
Yakut
Yiddish
Zapotec
Zulu
Acehnese
Acholi
Adangme
Afrikaans
Akan
Albanian
Algonquinian
Amharic
Ancient Greek
Arabic
Araucanian/Mapuche
Armenian
Assamese
Asturian
Athabaskan
Aymara
Azerbaijani
Azerbaijani (Cyrillic; old orthography)
Balinese
Bambara
Bantu
Bashkir
Basque
Batak
Belarusian
Bemba
Bengali
Bikol
Bislama
Bosnian
Breton
Bulgarian
Burmese
Catalan
Cebuano
Chechen
Cherokee
Chinese (Mandarin; Hong Kong)
Chinese (Simplified; Mandarin)
Chinese (Traditional; Mandarin)
Choctaw
Chuvash
Cree
Creek
Crimean Tatar
Croatian
Czech
Dakota
Danish
Dhivehi
Duala
Dutch
Dzonkha
Efik
English
Esperanto
Estonian
Ewe
Faroese
Fijian
Filipino
Finnish
Fon
French
Fulah
Ga
Galician
Ganda
Gayo
Georgian
German
Gilbertese
Gothic
Greek
Guarani
Gujarati
Haitian Creole
Hausa
Hawaiian
Hebrew
Herero
Hiligaynon
Hindi
Hungarian
Iban
Icelandic
Igbo
Iloko
Indonesian
Irish
Italian
Japanese
Javanese
Kabyle
Kachin
Kalaallisut
Kamba
Kannada
Kanuri
Karakalpak
Kazakh
Khasi
Khmer
Kikuyu
Kinyarwanda
Kirghiz
Komi
Kongo
Korean
Kosraean
Kuanyama
Lao
Latin
Latvian
Lingala
Lithuanian
Low German
Lozi
Luba-Katanga
Luo
Macedonian
Madurese
Malagasy
Malay
Malayalam
Maltese
Mandingo
Manx
Maori
Marathi
Marshallese
Mende
Middle English
Middle High German
Minangkabau
Mohawk
Mongo
Mongol
Nahuatl
Navajo
Ndonga
Nepali
Niuean
Northern Sotho
North Ndebele
Norwegian (Bokmål)
Nyanja
Nyankole
Nyasa Tonga
Nzima
Occitan
Ojibwa
Old English
Old French
Old High German
Old Norse
Old Provencal
Oriya
Ossetic
Pampanga
Pangasinan
Papiamento
Pashto
Persian
Polish
Portuguese (Brazil)
Portuguese (Portugal)
Punjabi (Gurmukhi)
Quechua
Romanian
Romansh
Romany
Rundi
Russian
Russian (old spelling)
Sakha
Samoan
Sango
Sanskrit
Scots
Scottish Gaelic
Serbian (Cyrillic)
Serbian (Latin)
Shona
Sinhala
Slovak
Slovenian
Songhai
Southern Sotho
Spanish
Sundanese
Swahili
Swazi
Swedish
Tahitian
Tajik
Tamil
Tatar
Telugu
Temne
Thai
Tibetan
Tigirinya
Tongan
Tsonga
Tswana
Turkish
Turkmen (Cyrillic)
Udmurt Ukrainian
Urdu
Uzbek
Uzbek (Cyrillic)
Venda
Vietnamese
Votic
Welsh
Western Frisian
Wolof
Xhosa
Yiddish
Yoruba
Zapotec
Zulu
Abkhaz
Acehnese
Acholi
Adangme
Adyghe
Afrikaans
Agul
Akan
Albanian
Algonquinian
Altaic
Amharic
Ancient Greek
Arabic
Araucanian/Mapuche
Armenian
Assamese
Asturian
Athabaskan
Avar
Aymara
Azerbaijani
Azerbaijani (Cyrillic; old orthography)
Balinese
Bambara
Bantu
Bashkir
Basque
Batak
Belarusian
Bemba
Bengali
Bikol
Bislama
Blackfoot
Bosnian
Breton
Bugotu
Bulgarian
Burmese
Buryat
Catalan
Cebuano
Chamorro
Chechen
Cherokee
Chinese (Mandarin; Hong Kong)
Chinese (Simplified; Mandarin)
Chinese (Traditional; Mandarin)
Choctaw
Chukchee
Chuvash
Corsican
Cree
Creek
Crimean Tatar
Croatian
Crow
Czech
Dakota
Danish
Dargwa
Dhivehi
Duala
Dungan
Dutch
Dutch (Belgium)
Dzonkha
Efik
English
Eskimo (Cyrillic, Latin)
Esperanto
Estonian
Even
Evenki
Ewe
Faroese
Fijian
Filipino
Finnish
Fon
French
Frisian
Friulian
Fulah
Ga
Gagauz
Galician
Ganda
Gayo
Georgian
German
German (Luxemburg)
German (old spelling)
Gilbertese
Gothic
Greek
Guarani
Gujarati
Haitian Creole
Hani
Hausa
Hawaiian
Hebrew
Herero
Hiligaynon
Hindi
Hungarian
Iban
Icelandic
Ido
Igbo
Iloko
Indonesian
Ingush
Interlingua
Irish
Italian
Japanese
Javanese
Jingpo
Kabardian
Kabyle
Kachin
Kalaallisut
Kalmyk
Kamba
Kannada
Kanuri
Karachay-balkar
Karakalpak
Kasub
Kawa
Kazakh
Khakass
Khanty
Khasi
Khmer
Kikuyu
Kinyarwanda
Kirghiz
Komi
Kongo
Korean
Korean (Hangul)
Koryak
Kosraean
Kpelle
Kuanyama
Kumyk
Kurdish
Lak
Lao
Latin
Latvian
Lezgi
Lingala
Lithuanian
Low German
Lozi
Luba
Luba-Katanga
Luo
Macedonian
Madurese
Malagasy
Malay
Malayalam
Malinke
Maltese
Mandingo
Mansi
Manx
Maori
Marathi
Mari
Marshallese
Maya
Mende
Miao
Middle English
Middle High German
Minangkabau
Mohawk
Moldavian
Mongo
Mongol
Mordvin
Nahuatl
Navajo
Ndonga
Nenets
Nepali
Niuean
Nivkh
Nogay
Northern Sotho
North Ndebele
Norwegian (Bokmål)
Norwegian (Nynorsk)
Nyanja
Nyankole
Nyasa Tonga
Nzima
Occidental
Occitan
Ojibwa
Ojibway
Old English
Old French
Old High German
Old Norse
Old Provencal
Oriya
Ossetian
Ossetic
Pampanga
Pangasinan
Papiamento
Pashto
Persian
Polish
Portuguese (Brazil)
Portuguese (Portugal)
Provencal
Punjabi (Gurmukhi)
Quechua
Rhaeto-romanic
Romanian
Romansh
Romany
Rundi
Russian
Russian (old spelling)
Rwanda
Sakha
Sami (Lappish)
Samoan
Sango
Sanskrit
Scots
Scottish Gaelic
Selkup
Serbian (Cyrillic)
Serbian (Latin)
Shona
Sinhala
Slovak
Slovenian
Somali
Songhai
Sorbian
Sotho
Southern Sotho
Spanish
Sunda
Sundanese
Swahili
Swazi
Swedish
Tabasaran
Tagalog
Tahitian
Tajik
Tamil
Tatar
Telugu
Temne
Thai
Tibetan
Tigirinya
Tok Pisin
Tongan
Tsonga
Tswana
Tun
Turkish
Turkmen (Cyrillic)
Turkmen (Latin)
Tuvinian
Udmurt
Udmurt Ukrainian
Uighur (Cyrillic, Latin)
Ukrainian
Urdu
Uzbek
Uzbek (Cyrillic)
Venda
Vietnamese
Votic
Welsh
Western Frisian
Wolof
Xhosa
Yakut
Yiddish
Yoruba
Zapotec
Zulu
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