It is an online library with open access to almost 4,000 e-books from the academic publishing house MDPI. The titles are available in full text and can be read online or downloaded in PDF format. Books are divided into ten collections, which cover practically all disciplines:

• Biology & Life Sciences
• Business & Economics
• Chemistry & Materials Science
• Computer Science & Mathematics
• Environmental & Earth Sciences
• Medicine & Pharmacology
• Physical Sciences
• Public Health & Healthcare
• Social Sciences, Arts & Humanities
• Technology & Engineering