MIT Open Courseware offers an extensive series of online courses in linguistics. Courses generally include lecture videos, assignments, exams, and more.
The Stanford Encyclopedia of Philosophy (SEP) is a freely-accessible online encyclopedia of philosophy maintained by Stanford University. Each entry is written and maintained by an expert in the field.
A collection of teaching materials on mathematical logic aimed at a non-mathematical audience, intended for use in advanced logic courses as taught in many philosophy departments.
