The best on-line source on philosophical topics is the Stanford Encyclopedia of Philosophy.
For historical information on particular philosophers, the Wikipedia entries are ok. Important philosophers worth reading about include: Plato, Aristotle, Aquinas, Hobbes, Locke, Hume, Descartes, Leibniz, Kant, Hegel, John Stuart Mill, and Charles Peirce. Influential twentieth-century philosophers include Bertrand Russell, Ludwig Wittgenstein, John Dewey, Edmund Husserl, W. V. O. Quine, John Rawls, and Thomas Kuhn.
Thagard's blog post on natural philosophy.
Thagard's critique of thought experiments.
The analysis of knowledge (SEP)
Thagard's article on epistemological metaphors.
Thagard's most recent article on coherence.
Does everything happen for a reason?
Computational Epistemology Laboratory.
This page updated Mar. 17, 2014.
