Science & Nature
1439 sites
Subcategories:
- Astronomy & Space (396)
- Chemistry (8)
- Earth Sciences (26)
- Biology (79)
- Physics (30)
- Mathematics (59)
- Weather & Climate (104)
- Amateur Radio (682)
- Electronics (47)
https://abrohamnealsoftware.com/
Neal K3NC's retirement announcement page for Abroham Neal Software, a company that developed amateur radio software including DXBase 2007 for logging and DX cluster operations. The site now serves as a legacy resource, offering free registration files and key generation tools for former customers of the now-closed software business.
https://ads.harvard.edu/books
The NASA Astrophysics Data System (ADS) Virtual Library offers free online access to a curated collection of astronomy and astrophysics books, ranging from Copernicus's 1543 classic to modern astrophysics textbooks. Researchers and enthusiasts alike can browse and print foundational works on celestial mechanics, stellar astrophysics, lunar science, and solar physics from leading institutions like Harvard and the Lunar and Planetary Institute.
http://lesnouvellesdx.free.fr/
Les Nouvelles DX is a French-language archive covering 25 years of publications from the DX newsletter of the same name, including QSL card galleries, contest results, expedition logs, and amateur radio history dating back to 1920. Visitors can explore rare QSL cards from Antarctic stations, French Pacific expeditions, historical prefixes, and online logs from operators at remote locations like Crozet Island.
https://www.qsl.net/in3vrr
Roberto Vendrame (IN3VRR) out of Bolzano, Italy offers LOGvrr, a freeware amateur radio logging suite featuring a logbook, international callbook with 1.8 million entries, and PacketCluster support. The site provides free downloads of the software in ARJ archives, ISO disc images, and supporting utilities for ham radio operators managing QSOs and LoTW confirmations.
https://xeno-canto.org/
Xeno-canto is a massive community-driven database of wildlife sound recordings from around the world, covering birds, frogs, mammals, bats, and more, browsable by region or taxonomy. Launched in 2005, it serves researchers, birders, and curious listeners alike with tens of thousands of freely downloadable recordings backed by an open API and active community forum.
https://w3eax.umd.edu/
W3EAX is the Amateur Radio Association at the University of Maryland, a student club with roots going back to 1933 and an ARRL-affiliated callsign. Their well-equipped shack includes HF, UHF/VHF, Amateur Television, and satellite gear, plus a full electronics workbench for hands-on radio experience.
https://astronomyinyourhands.com/
Created by Chris Hilder, Astronomy In Your Hands offers free hands-on astronomy activities for classrooms and home learners, including a well-known downloadable Star Wheel planisphere for identifying stars with minimal equipment. The site earned the prestigious Griffith Observatory Star Award and provides low-tech, DIY-friendly resources suited for kids, students, and teachers alike.
https://mushroomexpert.com/
MushroomExpert.Com, maintained by Michael Kuo, is a comprehensive reference covering over 1,300 mushroom species with detailed entries, identification keys, and photographs for each genus and species. It stands out as one of the most thorough free mycology databases on the web, covering everything from common yard fungi to rare and obscure species across North America.
https://spacewatch.lpl.arizona.edu/fmo-project/overview
The SPACEWATCH® FMO Project, run by the University of Arizona's Lunar and Planetary Laboratory, documents the detection of Fast Moving Objects, which are near-Earth asteroids passing so close that they appear as light trails in telescope imagery. The site explains the science behind close-approach asteroid detection, shares discovery images, and describes the citizen participation program that once helped identify faint FMOs.
https://rochesterastronomy.org/snimages
Bright Supernova, maintained by David Bishop, is a dedicated tracking resource for bright supernovae observations and images. This redirect page points to a larger archive at RochesterAstronomy.org, suggesting a substantial collection of supernova data and imagery for amateur and professional astronomers alike.