The Open Encyclopedia of Cognitive Science (OECS) is a free, online collection of multidisciplinary peer-reviewed articles on various topics in cognitive science. Officially launched last August by MIT Press, the OECS is a successor to the MIT Encyclopedia of Cognitive Science. It currently has around 80 articles, with more to come, on topics such as: Social Epistemology by Mandi Astola and Mark Alfano The Mind-Body Problem by Tim Crane Bodily Sensations by Frédérique de Vignemont Personal/Subpersonal Distinction by Zoe Drayson Conceptual Analysis by Frank Jackson Natural Kinds by Muhammad Ali Khalidi Cognitive Ontology by Colin Klein Free Will by Neil Levy Experimental Philosophy by Edouard Machery Metacognition by Joëlle Proust …to pick just ten. The editors of OECS are Michael C. Frank of Stanford University and Asifa Majid of the University of Oxford. You can check it out here.