Ringlink
Free CGI Perl program for running webrings
http://www.ringlink.org/

S+R Sensortec GmbH
Ladder
http://www.sensortec.de/index.htm

Telephone Ring Generator
Ring a telephone on stage or theatre, telephone ringer, bell telephone sounds, electronic ring generator, uk or usa telephone cadence, telephone props
http://www.precisiovision.freeuk.com/

Polydraulic Systems
Polydraulic Systems:: : Your source for the best O-rings and accessories. - O-Ring Kits ecommerce, open source, shop, online shopping
http://www.polydraulic.com

Psioneers Ring
A ring of Psion palmtop affectionados (all styles/all periods). We just all love our little Psions ;-) If you ever get the chance to get close to one of these beasts, beware, you will be mystified and
http://b.webring.com/hub?ring=psionring

The Web3D Ring
This ring is for real-time 3d only - interactive 3d content, VRML, X3D, 3d applets and plugins etc
http://www.webring.com/hub?ring=web3dring

Planetary Ring Node: Jupiter's Ring System
Overview of the Jupiter ring system. Many images, animations and references are included for both the scientist and the public.
http://ringmaster.arc.nasa.gov/jupiter/jupiter.html

Orthography Ring
This ring is dedicated to the reform of English spelling. It will connect sites that describe the problems with the traditional spelling of English and that propose solutions. It will also connect sit
http://www.webring.com/hub?ring=orthography

Oz Ring
Oz Ring Sports Equipment - Quality manufacturers of AFL, atheltics, basketball, boxing, golf, hockey, netball, rugby, soccer, tennis, and volleyball equipment.
http://www.ozring.com.au/

CAD User's Ring
CAD Users ring is a site dedicated to people who use and want CAD tools to make their work time more efficient
http://x.webring.com/hub?ring=caduser