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)
http://hamradio.de/
Hamradio.de is a German-language community hub for amateur radio enthusiasts, offering a fleamarket for used equipment, forums, contesting resources, club directories, and software. With sections dedicated to awards, DX, and contests, it serves as a comprehensive gathering point for the German-speaking ham radio community.
http://srim.org/
James Ziegler's authoritative site hosts SRIM and TRIM, widely used scientific software packages that calculate the stopping and range of ions in matter for research and engineering applications. The site includes downloadable software, textbooks, tutorials, a historical review spanning 100 years of ion stopping research, and resources covering topics from cosmic ray soft errors to neutron damage.
https://www.qsl.net/milark/main/links/general-links.html
The links page for L.A.R.K. (likely a local amateur radio club) compiles dozens of curated resources for ham radio enthusiasts, including club homepages, repeater directories, VHF/UHF resources, callsign tools, and mailing lists. It serves as a comprehensive jumping-off point for the amateur radio community in Southeast Michigan and beyond.
https://hamfest.org/
The Huntsville Hamfest is one of the longest-running amateur radio events in the United States, held annually since 1954 at the Von Braun Center in Huntsville, Alabama. In 2026 it will host the ARRL National Convention, featuring a dealer show, flea market, forums, licensing opportunities, and activities for the whole family.
http://capella-observatory.com/
Capella Observatory documents an amateur astronomical observatory situated atop the Kupferberg in Namibia, near Windhoek, offering a rare southern-hemisphere observing perspective. The site features astrophotography and deep sky observations including nebulae, globular clusters, and open star clusters captured with a 60cm telescope.
https://irts.ie/cgi/index.cgi
The Irish Radio Transmitters Society (IRTS) is Ireland's national amateur radio organization, offering licensing guidance, club directories, contest calendars, and membership services for ham radio enthusiasts across the country. Affiliated with the International Amateur Radio Union, the site serves as a central hub for Irish operators with resources covering repeaters, beacons, DXCC standings, awards, and emergency communications.
https://wt4ra.org/
The Western Tidewater Radio Association (WTRA) is an ARRL-affiliated amateur radio club serving Isle of Wight, Surry, and Southampton Counties in Virginia. The site lists upcoming events like QSO parties, flea markets, and Field Day, plus club resources including repeater info, ARES emergency communications, membership rosters, and weather service links.
http://w0abr.com/
The Hub City Amateur Radio Club (W0ABR) serves the Aberdeen, South Dakota area with regular club meetings, nets, and informal coffee gatherings for ham radio enthusiasts. The site lists upcoming events, links to local APRS activity and weather resources, and connects members to the ARRL and regional repeater networks.
https://epanorama.net/
Tomi Engdahl's ePanorama.net is a vast electronics reference site covering audio circuits, video systems, PCB design, embedded systems, RF, and much more, with hundreds of categorized links and original schematics. The accompanying blog keeps the resource current with news, product tests, IoT coverage, and cleantech topics, making it a go-to hub for electronics hobbyists and engineers alike.
https://qsl.net/wwvarc
The White Water Valley Amateur Radio Club of Richmond, Indiana operates under club callsign N9JM and maintains this site as an informational hub for local ham radio enthusiasts. Visitors can find repeater frequencies, net schedules, club newsletters, officer contacts, and photos from special events like the McMaze Daze station operation.