Biology
- Wikispecies or The Catalogue of Life - Species Databases
- Animalia or A-Z Animal - Animal Encyclopedia
- OneZoom: Tree of Life Explorer
- Lost and Found Nature: Rediscovered Animal / Plant Database
- BiologyOnline: Biology Articles
- Science Geek: Biology Study Guides
- LibreTexts Biology: Biology Learning / Guides
- Biodiversity Heritage Library: Biodiversity Research
- Alien: Artificial Life Simulator / GitHub / Video
- Metazooa: Species Connection Game
- Phenome10K: Biological / Palaeontological 3D Scans
- RecentlyExtinctSpecies: Recently Extinct Species Database
- UniProt: Protein Database
- iNaturalist: Organism Identification
- Ocearch: Track Marine Life
- The Deep Sea: Interactive Deep Sea Life Guide
- Pattern Radio: Listen to Whale Songs
- eBird, Audubon or AllAboutBirds: Bird Species Databases / IDs
- EuroBirdPortal: European Bird Distribution Map
- BirdSounds: Thousands of Bird Sounds Visualized
- Merlin or whoBIRD: Bird Picture / Sound Identification
- Featherbase: Bird Feather Database
- BugGuide: Insect Identification Community
- AntWeb: Ant Species Database
- Macroinvertebrates: Freshwater Macroinvertebrates Atlas
- Life Under the Ice: View Antarctic Microbes
- WhyDoCatsAndDogs...?: Pet Q&A Site
- Backyard Chickens: Chicken Raising Forum
- DinosaurPictures: Dinosaur Info / Images
- Pteros: Pterosaur Database
- WFO: Plant Database
- The Ferns: Tropical Plant Database
- ISODN Biology: ISODN Biology Discord Community