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://www.qsl.net/w3sz
Roger Rehr's W3SZ page is a long-running amateur radio site hosted on QSL.net, active from 1997 to 2007. The callsign W3SZ and the QSL.net hosting strongly indicate a ham radio enthusiast's personal presence on the web.
http://bsa13.com/jota
BSA13's Jamboree on the Air page documents Pack, Troop, and Crew 13's participation in JOTA, the annual worldwide event where Scouts communicate with each other via ham radio. Operating under callsign KE9JQ on 20 meters, BSA13 has contacted Scouts in over 25 countries using both voice and Morse code over 28 years of participation.
http://currentsky.com/
Bob Riddle's 'Qué tal in the Current Skies' is a long-running amateur astronomy site that began in the late 1980s as posts to the Big Sky Telegraph BBS and evolved over 30+ years into a web resource covering Earth and Space topics. The site now serves as a transitional landing page pointing visitors to his continuing work on Substack, with archived daytime and nighttime sky photos, calendar data, and astronomical observations.
http://weather.mailasail.com/Franks-Weather/Home
Frank Singleton's extensive weather and sailing resource covers marine meteorology, GRIB files, GMDSS services, weather communications, and practical forecasting guidance for sailors and cruisers. With cruising logs dating back to 2000, links to national weather services, and coverage of topics from basic atmospheric theory to climate change, this site is a remarkably thorough reference for anyone navigating at sea.
https://101science.com/Radio.htm
A comprehensive free electronics and electrical engineering reference hub covering everything from basic electricity and Ohm's Law to advanced RF design, DSP, amateur radio, and circuit simulation. With hundreds of curated links, formulas, tutorials, data sheets, and calculators organized across multiple phases of learning, it serves as a structured self-study guide for electronics enthusiasts and engineers alike.
https://warc1.org/
The Wichita Amateur Radio Club (WARC) has been serving Kansas ham radio enthusiasts since 1932, making it one of the longer-running amateur radio clubs in the region. The site features news about Field Day operations, repeater information, licensing resources, and club activities including visits from Wichita's mayor during Amateur Radio Week.
https://vu2ese.com/
Ashhar Farhan (VU2ESE) is an Indian radio amateur who designs and builds his own transceivers, SDRs, and test equipment, sharing full schematics and source code freely with the builder community. Highlights include the BITX SSB transceiver, the hackable sBitx SDR with integrated FT8 support, and a growing collection of homebrew test gear like spectrum analyzers and tone generators.
https://lynkeos.sourceforge.io/
Lynkeos is a SourceForge-hosted software project dedicated to processing planetary images captured with webcams, aimed at amateur astronomers looking to enhance their astrophotography. The tool focuses on stacking and refining low-quality frames to produce sharper planetary images, making it a niche but valuable resource for hobbyist planetary imagers.
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.
http://astronomyboy.com/
Jeff DeTray's AstronomyBoy.com is a rich resource for amateur astronomers covering everything from beginner telescope guides to DIY barn door trackers, homemade eyepieces, and mount repair tutorials. The site features constellation portraits, a deep sky observing list, eclipse photography tips, and detailed walkthroughs of equatorial mount mechanics, all drawn from Jeff's personal experience at his Black Swamp Observatory.