See also:
Artlandia SymmetryWorks Adobe Illustrator plug-in that automates creation of surface designs and ornaments based on seventeen wallpaper groups. On-line purchase. http://artlandia.com/products/SymmetryWorks/
Catalogue of Isohedral Tilings From the article "One Corona is Enough for the Euclidean Plane" by Doris Schattschneider and Nikolai Dolbilin. http://mathforum.org/dynamic/one-corona/
Chaos Tiles This chaotic tiling consists of two equilateral pentagons, with angles (80, 160, 60, 140, 100) and (40, 200, 60, 100, 140). Sets are for sale. http://www.mathpuzzle.com/chaotile.html
Escher Patterns Compiled by Yoshiaki Araki. http://britton.disted.camosun.bc.ca/jbaraki.htm
Escher Web Sketch Java applet drawing repeated patterns with selected symmetry. http://escher.epfl.ch/escher/
Frieze Patterns Definitions and images. http://plato.acadiau.ca/courses/educ/reid/Geometry/Symmetry/frieze.html
Grotesque Geometry Andrew Crompton's tiling and tessellation images. http://www.cromp.com/tess/home.html
Hans Kuiper Hans Kuiper's work. Tessellations and optical art. Also tessellation software with the 17 wallpaper groups. http://web.inter.nl.net/hcc/Hans.Kuiper/
Intriguing Tessellations By Marjorie Rice. Pentagons that tile the plane. Includes details and links. http://tessellations.home.comcast.net/~tessellations/
Java Kali A program for drawing symmetrical patterns based on any of the 17 wallpaper groups, as well as several frieze and rosette groups. http://www.geom.uiuc.edu/java/Kali/
Java Penrose Tiler A Java applet for experimenting with kites and darts. http://www.geocities.com/SiliconValley/Pines/1684/Penrose.html
KaleidoTile Software for Macintosh and SGI to create and manipulate tessellations of the sphere, Euclidean plane and hyperbolic plane, and to see how the Platonic solids are related to tessellations. http://www.geom.uiuc.edu/software/download/KaleidoTile.html
Landry Art Art of Kenneth Landry. Tessellations, polyhedra and polyhedra decorated with tessellations. http://www.landryart.com/
Mike Field University of Houston. Graphics and resources in symmetry and tiling. http://nothung.math.uh.edu/~mike/
Penrose Tiles Links in the Geometry Junkyard. http://www.ics.uci.edu/~eppstein/junkyard/penrose.html
TESS Tessellation software. 11 rosette, all 7 frieze and all 17 wallpaper groups included. http://www.peda.com/tess/
Tessellation and Photography A study for the endless possibilities of tessellating the plane based on the work of Dutch graphic artist M.C. Escher. http://members.home.nl/wouternimmo
Tessellation Links Compiled by Suzanne Alejandre for the Math Forum. http://mathforum.org/sum95/suzanne/links.html
Tessellation Tutorials by Suzanne Alejandre Tutorials and templates for making tessellations using ClarisWorks, the Geometer's Sketchpad, HyperCard, HyperStudio, and straightedge and compass, including step-by-step instructions for classroom activities. http://mathforum.org/sum95/suzanne/tess.intro.html
Tessellations A company selling foam puzzles, many based on planar tessellations (tilings) and fractals. http://members.cox.net/tessellations/
Tiling Plain and Fancy Tiling from the mathematical and historical viewpoint by Steve Edwards. Provides a number of examples of various types of tiles that tile the plane and includes periodic tiling plus Penrose's aperiodic tiles. http://www2.spsu.edu/math/tile/
Tilings and Geometric Ornament Applying principles of computer graphics to the creation of geometric ornament, as a continuation of the tradition of ornamental design using modern tools and algorithms. http://www.cgl.uwaterloo.ca/~csk/washington/tile/
Totally Tessellated An introduction to tessellations explaining the basic underlying mathematics, and with many examples from real life. http://library.thinkquest.org/16661/
Wallpaper Groups Images and descriptions of the 17 plane symmetry groups. http://www.clarku.edu/~djoyce/wallpaper/
William's Geometric Construction Page Activities to create patterns using simple resources, such as making equilateral triangle from a circle. Suitable for upper primary and lower secondary ages. http://www.cyffredin.co.uk/