- SETI Institute: The Search for Extraterrestrial Intelligence
 - Engaged in scientific and educational projects relevant to the nature, distribution, and prevalence of life in the universe. - Amateur SETI: Project BAMBI (Bob And Mike's Big Investment)
- Describes the design and construction of a 4 GHz amateur radio telescope dedicated to SETI.
- Are We Alone? - SETI Institute Science Radio
- Hosted by the SETI Institute's Senior Astronomer, Dr. Seth Shostak, Are We Alone? is a weekly hour-long radio magazine that covers a wide range of topics relevant to the new science of astrobiology.
- Arecibo Observatory
- Site of the world's largest single-dish radio telescope. Part of the National Astronomy and Ionosphere Centre.
- Columbus Optical SETI Observatory
- Contains extensive documentation on the Optical Search for Extraterrestrial Intelligence (OSETI) and the activities of the observatory.
- Cosmic Search Magazine
- Read the first four issues of this magazine that was only in publication for 13 issues, 1979-80. The editorial board included Arthur C. Clarke, Philip Morrison, and Carl Sagan.
- Harvard University SETI Group
- Official page for the research on SETI projects conducted at the Harvard University.
- Ohio State University (Big Ear) Radio Observatory
- Kraus-type radio telescope famous for the "Wow!" Signal and for the longest-running SETI project. The Big Ear was ceased operation in 1997 and was dismantled in 1998.
- Planetary Society's Search
- Organization which promotes advocacy, projects, and education of the public in space exploration including SETI programs.
- Quest for Extraterrestrial Intelligence
- Essay by the venerable Carl Sagan, from Cosmic Search magazine.
- SETI
- Includes the Drake Equation and a biography of Frank Drake.
- SETI and Distributed Computing
- Essay by Garrett Moritz.
- SETI Australia Centre
- The Australian division of a world-wide experiment carried out by a number of independent groups. Includes news and articles.
- SETI Endeavor
- Contains documentation, links, and related programs.
- SETI League
- Grass-roots, nonprofit, member-supported organization devoted to the Search for Extraterrestrial Intelligence.
- SETI Research and Development Institute
- Group of Australian and New Zealand SETI enthusiasts.
- SETI: Searching for Life
- Sky & Telescope includes background on the scientific search for intelligent life in the universe and descriptions and comparisons of searches currently under way.
- University of California, Berkeley Search For Extraterrestrial Civilizations
- Dedicated to providing an answer to the age-old question, Are we alone?
- Wikipedia: Drake Equation
- Developed by Dr. Frank Drake in the 1960's as an attempt to estimate the potential number of extraterrestrial civilizations in our galaxy that were within range of potential contact.
- Wikipedia: SETI
- SETI history, radio experiments, public information, and criticisms of the project.
- Wikipedia: Wow! Signal
- The Wow! signal was a strong narrowband radio signal detected in 1977 by Dr. Jerry Ehman. The signal lasted for 72 seconds and bore the hallmarks of a signal of non-terrestrial, non-solar system origin.
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