Here is the list of websites that offer free books in multiple languages. I checked the level of reading they offer so that you can choose easily. See below!
📖Just started learning a foreign language? Check a wonderful collection of books at Unite For Literacy, where you can choose to read a book in English and in the language of your choice (French, German, Russian, even Korean) - or choose Narration, and the book will be read out loud to you:
🌛A wonderful reading project, also good for beginners, offers fairy tales with a word-to-word translation to English. Listen to their read-alouds in French or German - great for a bedtime story:
📚Not the first year learning the language? Go to Audible (powered by the most famous bookstore in the world), click Start Reading button, and search for books in French or German. I did not see any books in Russian or Korean but their collection is growing. See for yourself:
🖥Another resource for books in French, German, Korean, and Russian, allows you to read scanned books online. To find books in your target language, do an Advanced search by language under Read Books tab: