The botanical library at the Blog “Jolube Consultor Botánico y Editor” (mostly in Spanish)

It is a freely accessible portal to historic botanical literature from the Missouri Botanical Garden Library.

Fundamental electronic library “Flora and Fauna”
Original name – Фундаментальная электронная библиотека «Флора и фауна» (mostly in Russian)

IUCN Library System

The Biodiversity Heritage Library

It improves research methodology by collaboratively making biodiversity literature openly available to the world as part of a global biodiversity community.