• Dark UFO.com. Exploring the evidence of the alien presence.
• ASKE - Association for Skeptical Enquiry (GB) New Address
• Atheist Alliance
• Australian Skeptics
• Bay Area Skeptics, San Francisco, California
• British and Irish Skeptics
• Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP)
• Danish Skeptics
• European Council of Skeptical Organisations (ECSO)
• False Memory Syndrome Foundation (US)
• Fraudwatchernetwork.com | Sylvia Browne Scam. Internet Fraud, Mail Fraud, Credit Card Fraud, Phishing, Phone Fraud
• Indian Skeptic
• Irish Skeptics
• James A. Haught's Home Page
• James Randi Educational Foundation (US)
• Jim Lippard's Skeptical Information Links
• Living Fossils in Short-Lived Waters
• Lynne Kelly with her bestselling book "The Skeptic's Guide to the Paranormal"
• Mike Hutchinson Books
• National Center for Science Education (US)
• National Council Against Health Fraud (US)
• New Zealand Skeptics (NZCSICOP)
• Norwegian Skeptics
• Ontario Skeptics
• Prometheus Books (Amherst, NY), the world's leading skeptical publisher
• Rocky Mountain Skeptics
• SIMPOS (Netherlands)
• Skeptic Magazine (US)
• Subscribe to E-Skeptic (free)!
• Skeptic News - The "What's New" Page for Skeptics (US)
• Skeptics' Dictionary
• This is True - Randy Cassingham's Dumbth News
• UFO-Sweden - the only Swedish UFO organization with scientific ambitions

Danish

• Danish Skeptics

Dutch

• SKEPP (Belgium)
• Stichting Skepsis (Nederlande)

Finnish

• Skepsis (Finland)

French

• Observatoire Zététique
• Association Française pour l'Information Scientifique / Science ... et pseudo-sciences
• Union Rationaliste

German

• Sozialer Einstiegsguide im Internet? Schaut doch mal in Stefan Bock's Meta-Sozialarbeit. Wirklich informative Linkseite.
• Angelika Lenz Verlag - Bücher für Humanisten
• Bücher von Josef Hanauer im Internet
• Centrales Erforschungs-Netz außergewöhnlicher Himmelsphänomene, Mannheim
• Der Ufo-Student - kritische Online-Zeitung zu Ufos
• Ehemalige GWUP-Homepage von Gerald Huber
• Freireligiöse Landesgemeinde Pfalz K.d.ö.R.
• Gerhard Kern's AKAZ - Zeitschrift für Religions- und Staatskritik
• Gesellschaft zur wissenschaftlichen Untersuchung von Parawissenschaften (GWUP)
• Humanistischer Verband Deutschlands
• Hundinis Zaubereien
• Roland Jehrings Paranormal Activities
• Stefan Gruner's Homepage

Italian

• CICAP - Scienza & Paranormale (Italy)

Norwegian

• Skepsis i Norge

Spanish

Swedish

• Vetenskap och Folkbildning
• UFO-Sweden