A Problem Course in Mathematical Logic; by Stefan Bilaniuk
   Volume I: Propositional and First-Order Logic. Volume II: Computability and Incompleteness.
   http://euclid.trentu.ca/math/sb/pcml/

ASL Committee on Logic Education
   Reports and resources from the Association of Symbolic Logic.
   http://www.phil.ucalgary.ca/asl-cle/

Around Gödel's Theorem
   (Hyper)textbook for students in mathematical logic, by Karlis Podnieks.
   http://www.ltn.lv/~podnieks/

Course on Description Logics
   Slides and notes by Enrico Franconi.
   http://www.inf.unibz.it/~franconi/dl/course/

Disjunction
   Theory and history of the binary connective 'or'; from the Stanford Encyclopedia of Philosophy by Ray Jennings.
   http://plato.stanford.edu/entries/disjunction/

Formal Methods Educational Materials
   A repository for information related to formal methods in education, including pointers to existing courses and suggestions for examples and projects.
   http://www.cs.indiana.edu/formal-methods-education/

Games Mathematicians Play
   Mathematical games from a logical point of view: strategies for games and using games in descriptive complexity.
   http://www.math.usf.edu/~mccolm/RGintro.html

Gödel's Theorem and Information
   G.J.Chaitin's proof of Gödel's theorem using arguments having an algorithmic information theory flavor.
   http://www.cs.auckland.ac.nz/CDMTCS/chaitin/georgia.html

Logic Software from CSLI
   Hyperproof, Tarski's World, Turing's World, and The Language of First-order Logic, educational logic software by Jon Barwise and John Etchemendy
   http://www-csli.stanford.edu/hp/

Logic Tutorial
   An interactive tool teaching basic formal logic, rendering truth tables as clickable Johnston diagrams. With notes on the Buddhist Nagarjuna and modern symbolic logic.
   http://logictutorial.com/

Logical Laws
   This page contains a collection of logical laws of the first-order logic. This collection is based on the Kleene's collection from his books 'Introduction to Metamathematics' and 'Mathematical Logic' and contains a few additions.
   http://sakharov.net/logic.html

Mission: Critical
   Interactive tutorial for critical thinking.
   http://www.sjsu.edu/depts/itl/

The Daily Translation
   Problems on translation into a logical system, drawn from the current news and updated daily.
   http://www.univnorthco.edu/philosophy/trans.html

The Logic Cafe
   An online textbook, courseware package, and homework assistant for introductory symbolic logic. Includes multimedia support.
   http://www.oakland.edu/phil/cafe/

The Logic Classroom
   A course in basic logic consisting of 5 studies with exercises and answers to promote the learning of logic. Homeschool, college, and seminary students.
   http://www.sjsu.edu/faculty/carranza/

The Logic Daemon
   On-line proof checker, and texts.
   http://logic.tamu.edu/

University of Alberta Logic Course
   Contains an introduction to logic and formal systems, revolving around the Mizar proof checker, and a guide to Mizar.
   http://ugweb.cs.ualberta.ca/~c272/