The Best iNaturalist Alternatives in 2026

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

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

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

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.

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

DeepLearning.AI offers short courses and specializations for learning artificial intelligence and data engineering.

Emergency Medicine Cases publishes free online medical education cases and clinical learning resources.

Full Stack Deep Learning shares news, community resources, and courses for people who build products using AI.

Easy Auscultation offers lessons, quizzes, and guides for learning heart and lung sounds.

Visitors can choose from interactive simulations on oPhysics to explore and learn about physics topics.

Learn data structures and algorithms through open-source implementations in multiple programming languages.

Study algorithms implemented in C++ through this open-source learning repository.

This article maps a possible curriculum for becoming a data scientist and discusses where to begin learning the field.

DermNet provides dermatology topics, images, cases, and a skin checker for learning about skin conditions.

Stop the Bleed offers American College of Surgeons training to help people learn to control bleeding.

Learn about coding and website creation from this curated list of YouTube channels.

fast.ai shares lessons and resources focused on making deep learning more accessible to learners.

OpenIntro creates educational materials designed to make learning more accessible.

Vittascience offers an online coding environment for learning with Arduino, micro:bit, STM32 and other hardware platforms.

QPaths offers physics and science learning pathways for amateur and experienced learners and provides a community link.

LibreTexts Engineering collects curated texts that can be used directly or remixed into customized learning materials.

The Borr Project provides pre-college mathematics resources and learning materials.

HDLBits provides Verilog practice exercises for learning hardware description and digital logic.