Equiv
Equiv is a program for the symmetry analysis of reflections, from single crystal diffraction data collection.
http://www.prencipe.net/nuova_cartella/download/equdos.zip - 56Kb - Download

Tess (Mac)
While you draw, Tess will maintain the symmetry group you have chosen- 24 rosette (circular), all 7 frieze (strip), and all 17 wallpaper groups are included. Illustrations may be printed from Tess or exported to GIF, JIF, PCX, DXF, SVG, and other formats.
ftp://ftp.peda.com/tess-ppc.sit.hqx - 720Kb - Download - Screenshot

Polygon Cruncher for 3D Photo Browser
Polygon Cruncher reduces the number of polygons of your objects without changing their appearance. You keep all details even at high optimization ratio. You also keep texture information, vertex colors. You can also optimized taking care of the symmetry of your objects. ... - Respect of symmetry for objects that are symmetrical - You can protect the border of the objects. ... You can work on a faces selection or on an invert faces selection. ... - You can apply Polygon Cruncher on one or more objects at the same time, on one or several materials.
http://www.mootools.com/plugins/download/3DPhotoBrowserPLY.exe - 8Mb - Download - Screenshot

Tile Builder
Tile Builder is a Photoshop-compatible plug-in for creation seamless patterns from images using symmetry rules. This plug-in will be useful for web designers, artists, photo and computer graphics enthusiasts. It allows you create fantastic attractive seamless patterns by one touch. ... Using selected area plug-in fills plane without gaps using symmetry operations (shift, rotation and reflection). ... You can adjust pattern size and edge overlapping for creation smooth transition between shape sides.
http://www.imageskill.com/tilebuilder/TileBuilderDemo_Setup.exe - 1Mb - Download - Screenshot

Tess
While you draw, Tess will maintain the symmetry group you have chosen- 24 rosette (circular), all 7 frieze (strip), and all 17 wallpaper groups are included. Tess also supports all 28 (29) types of Heesch tilings. Illustrations may be printed from Tess or exported to GIF, JIF, PCX, DXF, SVG, and...
ftp://ftp.peda.com/tess32.exe - 822Kb - Download - Screenshot

Kaleider
Kaleider manipulates images to emulate various Kaleidoscope, Mirroring, 3D Mirroring and Funneling effects. It is a capable graphics tool for people who are interested in symmetry, tiling, tessellation and mosaic patterns, with controls for manipulating images and tiles. ... This visual experience can be accompanied by music from the built-in Audio Player. ... Kaleider actions can be Scripted to create choreographed performances of dynamic art. ... The package contains a collection of sample photos to serve as source images for Kaleider effects, along with a few MIDI audio files and sample...
http://www.Whizical.com/download/KaleidTr.exe - 5Mb - Download - Screenshot

Tile Builder Art Pack
100 free patterns and 25 masks generated by Tile Builder. Tile Builder is a Photoshop-compatible plug-in for creation seamless patterns from images using symmetry rules. This plug-in will be useful for web designers, artists, photo and computer graphics enthusiasts. ... Using selected area plug-in fills plane without gaps using symmetry operations (shift, rotation and reflection). ... You can adjust pattern size and edge overlapping for creation smooth transition between shape sides. ... Our plug-in has unique flexibility and power: you can move, rotate and bend target shape in order to...
http://www.imageskill.com/tilebuilder/tbap1.zip - 3Mb - Download - Screenshot

Polygon Cruncher
Polygon Cruncher is a plugin for LightWave Modeler V5. x, V6. x, V7. x, V8. x or more / Inspire 3D and 3DS Max V3. x, V4. x, V5. x, V6. x, V7. x, V8. x / 3DS VIZ / Autodesk VIZ. Polygon Cruncher reduces the number of polygons of your objects without changing their appearance. ... You can also optimized taking care of the symmetry of your objects. ... - Respect of symmetry for objects that are symmetrical - You can protect the border of the objects. ... - Polygon Cruncher is very fast. ... - Polygon Cruncher keeps all UV textures channels information and vertex colors channels information.
http://www.mootools.com/plugins/download/PolygonCruncher.exe - 7Mb - Download - Screenshot

LeoPicture
LeoPicture provides a convenient instrumentation for manipulating images to broad specter of customers from digital photography amateurs to web designers and scientists. General features: Open and save image files in *. bmp;*. jpg;*. tif;*. gif;*. png;*. ... Analyze color distribution and symmetry patterns in image and create MS Word report. ... Change brightness, contrast, saturation, sharpness, scale up and filter noise of the whole image or selected area(s). ... Image enhancement. ... Intuitive, colorful, rich and transparent user interface All intermediate variants of picture are...
http://www.leokrut.com/leopicture.zip - 284Kb - Download - Screenshot

Liquib
Liquib treats an image as if it were a fluid, which can be distorted by various transformations to create liquid image and marbled paper type effects. It is a graphics tool (or toy) that attempts to translate mathematics into visual imagery. Manipulation Tools and Effects can be manually applied... Liquib effects can be reflected onto mirroring panels to create Tiles, which can optionally be centered to maximize symmetries. ... The visual display can be accompanied by music from the Audio Player.
http://www.Whizical.com/download/LiquibTr.exe - 3Mb - Download - Screenshot