Seamless Texture Generator (STG)
Create seamless textures from existing pictures. Also includes highlights and shadows removal, crop, rotate and perspective correction.
http://www.seamlesstexturegenerator.com

PhotoSEAM
Multimedia authoring and graphics software with MP3 support, great for autorun CD - a easy to use CD autorun and multimedia authoring tool
http://www.mediachance.com/pseam/index.html

AlesiaKaye.com
AlesiaKaye Photos, Art, Design and Freebies.
http://alesiakaye.com/

Seamless Textures Absolute Cross
Wide selection of hundreds of quality seamless background textures for use in Photoshop, websites, 3D modeling, and video game design.
http://www.absolutecross.com/graphics/textures/

Free Seamless Tiles from About.com
Free seamless tiles to use for backgrounds, pattern fills, textures, and more.
http://graphicssoft.about.com/library/free/tiles/bltiles001.htm

Seamless Object-Oriented Software Architecture: Analysis and Design of Reliable Systems
By Kim Waldén, Jean-Marc Nerson; Prentice Hall, 1994, ISBN 0130313033. In development, OO methods stand out in promise for code reuse and making program analysis, design, implementation a seamless process. Free download file, PDF.
http://www.bon-method.com/book_print_a4.pdf

Specialty Steel and Forge, Inc.
All Metals & Forge has combined the best aspects of a metal service center and forge facility with information about alloys, stainless steel, tool steel, forging, heat treating, custom melting, ferrous and non ferrous materials, custom hand rolled bars, and the metals industry.
http://www.steelforge.com

WorldPoint
Pioneered a software solution for the seamless globalization of World Wide Web sites, electronic commerce sites, and corporate intranets. WorldPoint Passport is the industryfs only scaleable Web site globalization solution, allowing webmasters to design a site in one language and deploy it in many languages. The content creation and management software product includes seamless connectivity to a collaborative network of professional translators.
http://www.worldpoint.com

GDN Background Images
Seamless tiles.
http://www.geocities.com/SiliconValley/Lakes/7048/gdnbgrounds.html

Marlin Studios
Publisher of seamless and tileable texture map CD-Roms for 2D and 3D computer graphics applications. Collections include general purpose, interiors, rustic exteriors, Sci-Fi, stonework, downtown surfaces and signs, virtual tree and foliage alpha maps, and ornamental textures. Secure, online ordering. Fast, low-cost, worldwide shipping.
http://www.marlinstudios.com/