Topics in Logic and Proof Theory - Brief introductions to combinatory logic, the incompleteness theorems and independence results, by Andrew D Burbanks.Dialogue Logic - Homepage maintained by Claus Zinn. Dialogue Logic is a game-theoretic approach to the semantics of logic proposed by Paul Lorenzen, in which validity is modelled by the existence of a winning strategy in a dialogue game between an advocate and an opponent.
Non Standard Logics - A comprehensive listing of flavours of non-standard logic with brief descriptions and references, compiled by Peter Suber.
Infinitary Logic - Article in the Stanford Encyclopaedia of Philosophy by John L. Bell. Infinitary Logic is a branch of formal logic where finitary formulae are replaced by potentially infinitary mathematical entities.
Modal Logic - Originally the study of deductive behavior of the expressions `it is necessary that' and `it is possible that', now also includes logics for belief, tense, the deontic (moral) expressions. From the Stanford Encyclopedia, by James W. Garson.
Logic System Interrelationships - Shows how a number of representative logics fit together. The interrelationships usually given as something of the form: System X is system Y plus the axiom Z. By John Halleck.
Computational Tools for Modal Logic - Resources collected by Renate Schmidt.
