The Galaxy Catalog
A collection of digital images of 113 nearby galaxies. Princeton University.
http://astro.princeton.edu/~frei/galaxy_catalog.html

Galaxy Pair Picture Gallery
Images of interacting galaxy pairs
http://crux.astr.ua.edu/pairs2.html

The Messier Catalog
Images of interacting galaxy pairs
http://seds.lpl.arizona.edu/messier/indexes.html

High Redshift Supernova Search
Project at Lawrence Berkeley National Lab to search for supernovas in very remote galaxies. This provides an accurate means of measuring the distances to remote galaxies and thereby determining the age of the universe.
http://www-supernova.lbl.gov/

European Network: The Formation and Evolution of Galaxies
Purpose is to understand the creation of galaxies and the universe has evolved. Plans to study distant galaxies at optical, infrared, and radio frequencies.
http://www.mpa-garching.mpg.de/Galaxien/EuroNet.html

Collection of Galaxy Pair/Interacting Galaxies Images
from the Department of Physics and Astronomy, University of Alabama.
http://crux.astr.ua.edu/pairstext.html

Extragalactic bookmarks
List of resources dedicaced to extragalactic astronomy: Databases, projects, education ...
http://www-obs.univ-lyon1.fr/~prugniel/galaxies_others.html

Dust in Spiral Galaxies
HST and ISO Results.
http://www.astr.ua.edu/keel/research/dust.html

Galaxies
NASA Windows to the Universe. Includes illustrations and introductory information about a variety of galaxies.
http://www.windows.ucar.edu/cgi-bin/tour.cgi?link=/the_universe/Galaxy.html&sw=false&sn=1&d=/the_universe&edu=high&br=graphic&back=/pluto/pluto.html&cd=false&fr=f&tour=

UMass High Energy Astrophysics Group
Research group primarily interested in high energy activities in galaxies, particularly the interplay between massive stars and the interstellar medium.
http://www.astro.umass.edu/ast_page/xray/heag.html

Phil Marshall
Explains gravitational lensing by clusters. Includes pictures of MS1054.
http://www.mrao.cam.ac.uk/~pjm43/

Galaxy Collisions
A review article for non-specialists.
http://arxiv.org/html/astro-ph/9908269/homepage.html

Galaxies
Many selected links to websites dedicated to galaxies.
http://www.galacticsurf.com/galaxieGB.htm

The Small Magellanic Cloud, SMC
Gives mathematical measurements relating this galaxy that orbits the Milky Way. Includes history about first known discoveries and links to photo galleries.
http://www.seds.org/messier/xtra/ngc/smc.html