Thread Rolls USA Inc.
Your one-stop source for all industrial threading needs. Engineering, designing, and manufacturing tools for the screw machine industry worldwide for over 25 years.
http://www.threadrollsusa.com

ZThreads
An advanced object-oriented, cross-platform C++ threading and synchronization library. [GPL]
http://zthread.sourceforge.net/

Binh's COM notes
Articles on using COM Callbacks and COM threading along with good source code examples.
http://www.techvanguards.com/stepbystep/comdelphi/

ZThreads
An advanced object-oriented, cross-platform C++ threading and synchronization library. [GPL]
http://zthread.sourceforge.net/

LinuxThreads FAQ
Frequently asked questions about the kernel-level multi-threading library for Linux.
http://pauillac.inria.fr/~xleroy/linuxthreads/faq.html

JK Tool Company Inc.
JK Tool manufactures high quality automatic threading machines, slotting machines, and perforating machines for PVC and HDPE pipe. PVC casing elevators and the Kwik Klamp
http://www.jktool.com

Ã…ke Wallebom Software
Maker of EYEdent-D, a multi-threading Identification Daemon. [Win95/98/Me/NT/2000]
http://www.ake.nu/software/

Stefanelli Macchine
Italy. Designer and producer of machines for threading cord into articles of clothing. Site can be viewed in many languages.
http://www.stefanellimacchine.com/

Posithread UK Ltd
Full service agency based in Newcastle Upon Tyne, The Abbey Design Studio offers professional photography and interactive solotions
http://www.posithread.co.uk/

US Tool Inc.
Specializes in supply of indexable grooving and threading inserts, round and dovetail forming tools, and standard or modified toolholders.
http://www.ustool.biz