Genetica 

Genetica 2 is a seamless texture editor with over 500 texture presets and automatic seamlessness. Among hundreds of new features are a new Substance Lab, a new Weather Lab, a new Cut & Tile Lab, and much, much more. Also comes in Pro edition.
seamless wood metal stone texture textures graphics 3d material shader shaders seamless texture seamless textures

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. Illustrations may be printed from Tess or exported to GIF,JIF,PCX,DXF,SVG,and other formats.
tessellations symmetry drawing illustrating patterns heesch manifold