Non-Commercial Amateur Radio Project and Technology Websites (Annotated MLA List)

The sites below are oriented toward experimental or open development in amateur radio (e.g., SDR, digital modes, mesh networking, satellites). I have focused on non-commercial, community, nonprofit, or open-source project sites rather than storefronts.

Link verification notes

Links were checked for continued validity on 22 Feb. 2026. Most sites returned content normally. A small number of sites may rate-limit or block automated fetchers; their URLs below are still the canonical project homes.

Quisk (N2ADR): https://james.ahlstrom.name/quisk/ (official); mirror/source: https://github.com/jimahlstrom/quisk
GNU Radio: https://www.gnuradio.org/ (official); mirror/source: https://github.com/gnuradio/gnuradio

Works Cited (Annotated)

Ahlstrom, James C. (N2ADR). "Quisk, A Software Defined Radio (SDR)." , . Accessed 22 Feb. 2026.

Experimenter-oriented SDR application designed to be extensible and hackable-often used with homebrew and Hermes-Lite-class hardware.
Amateur Radio Digital Communications (ARDC). "Grants." , . Accessed 22 Feb. 2026.

A private foundation that funds amateur-radio and digital-communications R&D and open technology through grants (useful for finding cutting-edge projects to follow or replicate).
Amateur Radio Emergency Data Network (AREDN). "Amateur Radio Emergency Data Network." , . Accessed 22 Feb. 2026.

Open, community-developed firmware and documentation for high-speed amateur mesh networking (Microwave/Wi-Fi-class gear repurposed under Part 97, with ongoing releases).
AMSAT. "AMSAT - The Radio Amateur Satellite Corporation." , . Accessed 22 Feb. 2026.

Nonprofit satellite-amateur organization with resources on spacecraft, payloads, and current amateur satellite operations-useful for modern space and SDR ground-station work.
British Amateur Television Club (BATC). "BATC Wiki." , . Accessed 22 Feb. 2026.

Community wiki for amateur television and modern DATV projects, including hardware, repeaters, and operating guidance.
FreeDV Project. "FreeDV." , . Accessed 22 Feb. 2026.

Open-source HF digital voice stack (including newer ML/DSP modes such as RADE), with downloads, docs, and ongoing development notes.
GNU Radio Project. "GNU Radio." , . Accessed 22 Feb. 2026.

The flagship free/open SDR DSP toolkit-core infrastructure for many experimental modulation, decoding, and RF prototyping projects.
Ham Radio Science Citizen Investigation (HamSCI). "Ham Radio Science Citizen Investigation." , . Accessed 22 Feb. 2026.

Cutting-edge citizen-science projects at the intersection of propagation/ionosphere research and amateur radio instrumentation and experimentation.
HamWAN. "HamWAN." , . Accessed 22 Feb. 2026.

501(c)(3) network engineering and best-practices for multi-megabit IP-based amateur microwave networks (real-world Puget Sound implementation plus standards).
M17 Project. "M17 Project." , . Accessed 22 Feb. 2026.

Open protocol and ecosystem for digital voice/data (open hardware and software), designed explicitly to enable experimentation without licensing barriers.
OpenRTX Project. "OpenRTX." , . Accessed 22 Feb. 2026.

Free/open firmware for selected digital amateur radios; relevant for those exploring fully-open stacks (firmware through RF) and custom features.
OpenWebRX. "OpenWebRX Web-Based Software Defined Radio." , . Accessed 22 Feb. 2026.

Open-source multi-user web SDR platform for sharing receivers and experimenting with remote monitoring/decoding pipelines.
OZ9AEC. "Gpredict: Free, Real-Time Satellite Tracking and Orbit Prediction." , . Accessed 22 Feb. 2026.

Open satellite tracking/orbit-prediction software used by many ham-sat operators and builders; useful alongside modern SDR ground stations.
PD9Q (Packet-radio.net). "Direwolf." , . Accessed 22 Feb. 2026.

Project-oriented packet radio hub with Dire Wolf (software TNC/modem for AX.25 and APRS), installation notes, and related packet tooling.
SatNOGS. "SatNOGS." , . Accessed 22 Feb. 2026.

Open-source global network for building and coordinating satellite ground stations-highly relevant to amateur satellite reception and telemetry projects.
Tucson Amateur Packet Radio (TAPR). "Digital Communications Conference (DCC) Papers." , . Accessed 22 Feb. 2026.

Proceedings archive from the ARRL/TAPR Digital Communications Conference-a high-signal source for new ideas in digital modes, protocols, and RF/data systems.
Turner, Clint (KA7OEI). "Clint's Page(s)." , . Accessed 22 Feb. 2026.

Deep technical write-ups on homebrew and experimental VHF/UHF/microwave, frequency standards, and related build notes-excellent for advanced RF experimenters.
WSJT Development Group. "WSJT-X." , . Accessed 22 Feb. 2026.

Open-source weak-signal digital communications suite (FT8/FT4/Q65 and others), a major driver of modern DSP and protocol experimentation in amateur radio.