The Bilingual Picturebook project comes from the belief that a child’s first contact with a book should always be in their native language. Demand for bilingual books is enormous, but there are very few available. To remedy this German charity BucherPiraten has assembled a network of book makers and promoters as well as translators to create a unique online database of bilingual book written by children for children.
With the guidance of writers and artists, ten children from Germany created the first book in the collection, Chocolate Cake in Hawaii, which was later translated professionally into Mandarin, Arabic, English, French, Russian and Spanish. This book was then uploaded on the website where it is downloadable for free by anyone who wants to read it... or translate it. Native speakers of any language can submit a new translation of this and all the other titles in the database. This translation is then reviewed by another native speaker before it is added to the collection.
Many of the books are also available as audio books. Before downloading your chosen title, you decide which two languages you need, for a unique experience to suit your linguistic needs.
More info here.