Mathematical Logic and Foundations - From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory.
Abstract Service - An archive of abstracts of logic articles at the Institute for Logic, University of Vienna.
Math Front: LO Logic - Front end for the logic section of the mathematics e-print arXiv.
Computability Logic Homepage - Main online source on computability logic - a recently emerged formal theory of computational tasks and resources. Maintained by G.Japaridze.
