If you are aware of other graded reader series, please contact us and we will add them to the list.
Chinese
Chinese Breeze Series 23 books 北京大学出版局
Others: Mandarin Companion Only 8?
Chinese Graded Reader 1, 2,3 (SIngle books with multiple stories）Sinolingua Publishers
Amazon has quite a few one-off readers
ELI (Italy) — 9
Note, however, that there is a LOT of study material online!
Japanese
Tadoku.org
Japanese Graded Readers — 102
Taishukan Graded Readers — 65
Nihongo Tadoku Books — 9
OMG — 13
Genki Tadoku Readers — 4 boxed sets, 46 in total
Spanish
BlackCat (Cideb) Italy — 50 (MReader has quizzes for 26 BlackCat titles)
ELI, Italy — 60
Egmont — 25
French
BlackCat (Cideb) Italy — 80
ELI, Italy — 90
Egmont — 45
Italian
BlackCat (Cideb) Italy — 35
ELI, Italy — 24
Egmont – 20
German
BlackCat (Cideb) Italy — 80
ELI, Italy — 60
Egmont — 45
Russian
ELI, Italy — 4
Egmont — 3
Language Practice Publishing — 10 (Available on Amazon)
Arabic — Around 150, various publishers. (MReader has quizzes for 85 titles)