- ARKive
- Extensive collection of videos, images, and fact-files showcasing the species of the world.
- BioLib
- Plant, fungi, and animal database. Includes news, forums, and an image gallery.
- Cladoscope Cladogram of Life
- Presents a taxonomic listing encompassing all organisms on the planet.
- Encyclopedia of Life
- Online source for information featuring various species of organisms on Earth.
- Integrated Taxonomic Information System
- Taxonomic information on plants, animals, fungi, and microbes found in different parts of the world.
- National Center for Biotechnology Information Taxonomy Browser
- Provides access to the database. Includes links to the most common species used in molecular research.
- Species 2000 Catalogue of Life Programme
- Ongoing project aimed at indexing all plants, animals, microbes and fungi found on Earth.
- Species Accounts
- Provides a phylogenetic listing of the world's existing life forms. By Stephen Gene Sullivan.
- Tree of Life Eukaryotes
- Information on the group of organisms with nucleated cells that include plants, animals, fungi and the protists. Includes distinguishing features and major divisions.
- TreeBASE
- Provides a relational database of phylogenetic information hosted by the Yale Peabody Museum.
- Wikispecies
- Free directory of animal, plant, and fungal species.
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