Critical Thinking Web has been developed and maintained by a professor at the University of Hong Kong. His resource aims “to provide free online learning resources on critical thinking, to assist teachers and students alike, both in Hong Kong where the project is based, and in countries around the world.” There are various learning modules, quizzes, and links to other critical thinking resources.
The Internet Encyclopedia of Philosophy provides detailed, scholarly information on key topics and philosophers in all areas of philosophy. The Encyclopedia’s articles are written with the intention that most of the articles can be understood by advanced undergraduates majoring in philosophy and by other scholars who are not working in the field covered by that article.
The Stanford Encyclopedia of Philosophy is an elaborate but direct encyclopedia and a very good place to supplement philosophical readings. From its inception, the SEP was designed so that each entry is maintained and kept up to date by an expert or group of experts in the field.
Writing a Philosophy Paper is Peter Horban’s meditation on how to write a philosophy paper which is very insightful and provides a clear list of things a writer should, and should not do when writing in a philosophical style.