Atheist Alliance International is a global federation of atheist and freethought groups and individuals committed to educating its members and the public about atheism, secularism, and related issues, and to be a positive global voice for atheism and secularism.


Bay Area Humanists  promote humanism -- an ethical, democratic, naturalistic life stance that prioritizes reason, scientific, and critical thinking -- as well as a system of humanist ethics and secular values as a rational alternative to ethics/values based on religion.


Bay Area Skeptics is one of the SF Bay Area's oldest and longest running science and skepticism organizations, promoting reason and critical thinking through regular meetings, SkepTalks, and social media.


Camp Quest West  provides an educational adventure -- shaped by fun, friends, and freethought -- featuring science, natural wonder, and humanist values


 

David Fitzgerald writes books that critically examine historical claims of religions (more fun than it sounds!).


 

East Bay Skeptics Society is a monthly discussion group dedicated to the advancement of reason, science, and intellectual integrity, and to the exposure of superstition, fraud, and pseudoscience.


Guerrilla Skepticism on Wikipedia editing team improves skeptical content on Wikipedia by improving pages of our skeptic spokespeople, providing noteworthy citations, and removing the unsourced claims from paranormal and pseudoscientific pages.


Mad Art Lab is a group blog about the intersection of art, science, skepticism, secularism, humanism, atheism, and geek culture.


Independent Investigations Group is the local affiliate of an international network of trained investigators who will not only look into paranormal, fringe science, and extraordinary claims in their own regions, but also administer the IIG $100,000 Challenge.


Sacramento Area Skeptics is a nonprofit dedicated to promoting scientific skepticism in our community and around the world.


Secular Coalition for California  represents secular Californians in our state capitol.


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Secularity Clothing is an independent clothing brand from the Bay Area that focuses on promoting secular values, heroes of science, and compassionate living.


Secular Student Alliance empowers secular students to proudly express their identity, build welcoming communities, promote secular values, and set a course for their lifelong activism.


Seti Institute is a private, nonprofit organization dedicated to scientific research, education, and public outreach; its mission is to explore, understand, and explain the origin, nature, and prevalence of life in the universe, through research in astrophysics, planetary science, and the search for extraterrestrial intelligence.


Stanislaus Humanists believe in doing good for its own sake. We're all about educating ourselves on how to make this world a better place, and we encourage and support each other in putting our knowledge into action.


Sunday Assembly Silicon Valley is a radically inclusive local branch of Sunday Assembly (featuring all the best bits of church without the religion) that celebrates life and welcomes all people, with or without faith, and supports everyone fulfilling their potential.


Surlyramics is art you can wear: handmade ceramic jewelry inspired by science, nature, and critical thinking.


 

 The Brick Bible presents stories from the Bible illustrated in Lego bricks, including the ones not taught in Sunday School.


Wonderfest, the Bay Area Beacon of Science produces in-person and online science programs that stimulate curiosity, promote careful reasoning, challenge unexamined beliefs, and inspire life-long learning.