The Best A-Z Animal Alternatives in 2026

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

A natural history newsletter archive covers plants, trivia, and biology through its indexed pages.

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

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

The Catalogue of Life provides a reference list of the world's species.

FlowingData publishes articles, projects, and learning resources about data visualization and statistics.

Bartosz Ciechanowski publishes interactive articles about science and engineering, including a feature on the Moon.

Browse a curated collection of HTML5 resources, including articles, standards, and multimedia topics.

A curated list collects engineering blogs for readers looking for articles and perspectives from the field.

MathNet lets users browse and search more than 30,000 Olympiad-level problems from 47 countries in 17 languages.

Bird Sounds presents a collection of bird recordings, with sounds credited to the Macaulay Library and collaborators.

507 Mechanical Movements presents an indexed collection of mechanical movement diagrams and thumbnails.

EMRap provides medical education resources including courses, procedures, imaging, and videos.

Passmedicine offers online revision for the 2026 UCAT, with resources for exam preparation.

The OpenRocket wiki provides collaboratively written documentation for the open-source model rocket simulator.

ThrustCurve provides model and high-power hobby rocket motor data, including manufacturer specifications and certified performance.

IBM SkillsBuild provides free AI and technology teaching resources, including lesson plans, educator training, and toolkits.

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

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

Periodic Table App lets users search chemical elements and view properties in an interactive periodic table.

Outerzone lets visitors search and browse plans for model aircraft, including its catalog of more than 16,000 plans.

Sectional Anatomy presents CT and MRI sectional anatomy resources for body regions including chest, abdomen, head, and wrist.

PC Progress provides website account and information resources for visitors and general users.

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