Critical thinking
- Foundation for Critical Thinking — Research-based frameworks, lesson plans, and assessment tools for teaching critical thinking at all levels.
- Your Logical Fallacy Is — Visual guide to common logical fallacies. Printable poster available.
- Your Bias Is — Companion to the fallacy guide, covering cognitive biases.
- Coursera: Critical Thinking Skills — Free online course from the University of London.
Science education
- National Center for Science Education — Defends the teaching of evolution and climate science in public schools. Resources for teachers and parents.
- Khan Academy — Free courses in biology, chemistry, physics, and cosmology.
- Understanding Science (UC Berkeley) — How science works — a free resource for teachers and students.
Philosophy for young people
- Teaching Children Philosophy — Discussion guides linked to children's books. Free and well-organized.
- Stanford Encyclopedia of Philosophy — The definitive free reference for academic philosophy.
- Philosophy Experiments — Interactive thought experiments for exploring ethical and philosophical questions.
Debate and rhetoric
- Iron Chariots Wiki — Counter-apologetics resource covering common religious arguments and responses.
- RationalWiki — Community wiki analyzing pseudoscience, authoritarianism, and fundamentalism.
For educators
- Camp Quest Educator Resources — Secular education activities and curricula.
- Secular Student Alliance Resources — Starting and running secular student groups.