Science
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Open Textbook Initiative
A curated list of free open textbooks in mathematics from the American Institute of Mathematics, covering topics from ca…
OpenStax
A Rice University nonprofit publishing free, peer-reviewed, openly licensed textbooks for college and high-school subjec…
OpenStax
Free peer-reviewed college textbooks in math, science, social sciences and humanities, readable online and downloadable…
Optimum Sports Performance
A blog by Patrick Ward, PhD, covering sports science, strength and conditioning, physical therapy, and nutrition with re…
Orbital Central
Home of the Orbital Viewer, which shows atomic orbitals in all their glory, along with shareware cribbage, a picture vie…
Orbital Focus
An amateur hobbyist site tracking the International Space Station, satellites, and human spaceflight news with a UK pers…
Orca Grotto
A heartfelt personal Neocities fan page devoted to orcas, with fun facts, famous whales, orca movies, pictures, adoptabl…
Organic Chemistry Data
An encyclopedic collection of reference data, resources, and links for organic chemists, curated by the ACS Division of…
Organic Syntheses
A free archive of peer-reviewed, independently checked procedures for making organic compounds, a long-running reference…
Orion's Arm
A collaborative hard science fiction worldbuilding project running since 2000, an encyclopedia of the next 10,000 years…
Our Houseplants
A houseplant hub with care profiles for popular species from the African violet to the ZZ plant, covering light, waterin…
Our Permaculture Life
A collection of free permaculture resources from educator Morag Gamble on edible gardens, low-impact living and building…
Outerzone
A large collection of free vintage model aircraft plans to download, preserving classic designs for builders of flying m…
Outside My Window
A blog of birds and nature by Kate St. John, sharing close observations of wildlife and the seasons for anyone who likes…
Owners of Pet Skunks
A volunteer info site for pet skunk owners with pages on care, diet, research, rescues, photos and a free newsletter, wr…
Pablo Garcia
Projects by artist Pablo Garcia exploring drawing machines and optics, including the NeoLucida, a revived camera lucida,…
paddlesteamers.info
An enthusiast's database of side-wheel paddle steamers past and present, with photos of surviving ships, histories of fa…
PADI Blog
The blog of a leading scuba training organization, with diving tips, dive travel guides, marine life encounters and cons…
PainScience
Deeply referenced guides to chronic pain, injuries, and recovery science written by former massage therapist and science…
Palaeontology Online
A website covering all aspects of palaeontology, with articles drawn in part from the experience of working palaeontolog…
Paleo Network
A curated hub linking to independent paleontology blogs and sites, making it easy to explore deep time from Earth's orig…
Paleontological Society Blog
The blog of the Paleontological Society, with book reviews, research notes on topics like early eukaryotes, and news fro…
Panthera
A global wild cat conservation organization sharing research and stories on lions, tigers, jaguars, and other big cats i…
Paper Models of Polyhedra
Free printable nets for building paper models of Platonic and Archimedean solids, star polyhedra, compounds, kaleidocycl…
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