The Efika book is a free multilanguage ebook dedicated to the Efika mainboard from Genesi. It contains information about the Efika hardware, its setup and its supported operating systems (Linux distributions, MorphOS). The latest version can already be freely downloaded in English, French and Swedish. Some older versions can also be found in Czech, Italian and Russian. It will be available soon in other languages such as Spanish, German, Turkish, Greek, Portuguese and Polish. This book follows his previous work on the Pegasos book.