Society of Amateur Radio Astronomers - Dedicated enthusiasts who teach, learn, trade technical information, and do observations of the radio sky.

Amateur Radio Astronomy - Construction of the antenna, system descriptions, objectives, typical results, and references.

Amateur SETI - Equipment information with images, software and manual, formulas, javascript calculator, readings, sample data plots, glossary, and links.

Amateur SETI - Project BAMBI - Design, construction, and initial observational results of a 4-GHz amateur radio telescope with circuit board layouts, software, and schematics.

Basics of Radio Astronomy - Workbook developed to support training for the Goldstone-Apple Valley Radio Telescope, but can be applied to all.

Big Ear Radio Observatory - No longer in operation, and includes a beginner's guide, facility and equipment information, press releases, and slide shows.

EME, SETI, Radio Astronomy, DSP, and Radio Amateurs - Dedicated to building bridges between amateur groups and the promotion and preservation of weaksignal communication.

The European Radio Astronomy Club - Observations, workshop, groups, telescopes and images, and radar links.

JupiterRadio - Dedicated to observing and analyzing natural decametric radio emissions from Jupiter and the sun.

Multi-SETI@Home Monitor - Graphical add-on package to monitor activity that may be running on multiple computers over a network or multiple instances on the same computer.

National Radio Astronomy Observatory - Current events, public outreach, very large array, VLA expansion project, and very long baseline array.

3peaks Radio Telescope - Radio telescope project with diagram and graphs.

Pisgah Astronomical Research Institute - Dedicated to providing research and educational access to radio and optical astronomy for a broad cross-section of users.

Radio-Sky Publishing - Provides software (some free), books, and hands-on projects within areas of Jupiter, the Sun, Pulsars, and other areas.

SETI Research & Community Development Institute - A non-profit organization dedicated to the search for extra-terrestrial intelligence. Located in Brisbane, Australia.

UKARA Net - Amateur radio astronomy mainly for, but not limited to, the United Kingdom, providing information for beginners, project ideas, articles, and downloadable archive material.