The Best The Catalogue of Life Alternatives in 2026

Map of Life lets users explore species data and information about its biodiversity platform.

The Wikispecies project lets visitors browse and contribute information about species through its online reference pages.

iNaturalist lets users record plant and animal observations, share them with others and learn about the natural world.

OneZoom lets visitors browse an interactive tree of life, with suggested starting points for groups of organisms.

A-Z Animal provides an online collection of animal information and articles about the natural world.

Follow tutorials for building network servers on Linux distributions and Windows Server with Server World.

The ALIEN artificial life environment provides project objectives, getting-started information, and contributor guidance.

The Marine Biodiversity Portal of Bangladesh provides information about marine species and ecosystems in the country.

RecentlyExtinctSpecies documents recently extinct, missing, and other species in an online database.

This Android app recognizes bird species from their sounds and includes an extensive database of bird recordings.

Explore the Animalia online encyclopedia for information about familiar animal species and ones that may be less well known.

The Photographic Periodic Table presents element information alongside photographs and reference material.

The SmartCockpit site provides an online aviation library with quizzes, news, and reference material.

Compare JDK releases and requirements for building and running Java applications using this reference.

ProofWiki collects mathematical proofs and reference material in an online wiki.

EyeWiki offers an eye encyclopedia written by physicians and surgeons, with reference information for readers.

AerospaceWeb publishes reference material on aviation, space, design and engineering.

The Merck Index provides a searchable reference for chemical substances by name or CAS Registry Number.

Visitors can use Wumbo as a math reference site for students, teachers, and enthusiasts.

MSD Manuals provide medical reference material in multiple versions for different audiences.

HyperPhysics presents a concept reference with indexes for videos, demos, class materials, papers, and connections to chemistry, geophysics, and biology.

PocketMacros offers macroinvertebrate identification resources, navigational views, and related reference materials.

HemOnc offers a wiki reference for hematology and oncology topics for medical readers.

EngineersEdge provides reference data and practical tools for engineers working across technical disciplines.