Asetek
- Provides water and vapor cooling products, company and product info, and customer support.
- http://www.asetek.com/

Flabbergast
- Australian supplier of water cooled components. Includes online product catalog, product information, installation guides, and other helpful water cooling information.
- http://www.flabbergast.com.au

Aqua Computer
- Offers water cooling components and accessories. Features product information, online catalog, customer support, forum, and contact information.
- http://www.aqua-computer.de/e_index

Koolance
- Manufacturer of cases, cooling systems. Offers water cooling equipment, components, and accessories. Features product information, news and reviews, online catalog, and customer support.
- http://koolance.com

PC Water Cooling
- Offers water cooling components and accessories, FAQs, online shopping, reviews, and contact information.
- http://www.pc-water-cooling.com/

XSPC : Performance PC Cooling
- Offers product images and information, manuals, reviews, reseller links, and contact information.
- http://www.xspc.biz/

Aqua Pc's
- Provides pumps, radiators, reservoirs, kits, and accessories. Features illustrated product catalog and online sales.
- http://www.aqua-pcs.co.uk/

Cooling Works
- Design and manufacture of shrouds, sleeves, and radiators. Features company background, product details, reviews, and ordering information.
- http://www.coolingworks.com/

Water-Cooling.com
- Features news, reviews, articles, case gallery, guides and forum.
- http://www.water-cooling.com/

The Cooling Emporium
- Provides watercooling products, cases, and accessories. Features illustrated catalog and online shopping.
- http://www.thecoolingemporium.co.uk/

WaterCooling UK
- Water cooling forums, blocks, pumps, tubing, kits, tools, and other accessories.
- http://www.watercoolinguk.co.uk

Hardware Labs
- Manufacturer of Black Ice high performance radiators. Features product picture gallery, product, reseller, and contact information.
- http://www.hwlabs.com/

Alphacool
- Watercooling news, components, systems, accessories, and forum.
- http://www.alphacool.de/

Heatsink Factory
- Offers PC Cooling and Overclocking Gear. Watercooling blocks, cables, fans, and other accessories.
- http://www.heatsinkfactory.com

Computers and Components Central
- Custom PC Components and Water Cooling blocks, radiators, pumps, tubing, and accessories.
- http://www.candccentral.co.uk/

Howstuffworks: Cooling PC With Liquid
- Tutorial on how watercooled PCs work.
- http://computer.howstuffworks.com/liquid-cooled-pc1.htm

Petra's Tech Shop
- Offer computer cases, water blocks, watercooling kits, game gear, and other computer accessories.
- http://www.petrastechshop.com/

Sharka Computers
- Store that offers water blocks, radiators, reservoirs, fittings, tubings, and other water cooling accessories.
- http://www.sharkacomputers.com/

HighSpeedPC
- Sells computer workbench, water cooling and overclocking gear.
- http://www.highspeedpc.com

ThermoChill
- Manufacturer of PC watercooling equipment and case modification hardware.
- http://www.thermochill.com

Overclockers.com - Watercooling Section
- Several reviews and user tips on water-based cooling systems for PCs.
- http://www.overclockers.com/topiclist/index31.asp

Watercooling 101
- Forums, reviews, guides on watercooling.
- http://www.wc101.com

Athlon Watercooling Adventures
- Details the installation and testing of a water cooling apparatus for a AMD Athlon processor.
- http://www.nyx.net/~smanley/watercool

Cooltechnica.com
- Offers watercooling cases, fans, kits, pumps, reservoirs, radiators, power supplies and other accessories. Features online catalog, news, and sales.
- http://www.cooltechnica.com

Tekheads UK
- Selling watercooling, overclocking bits, and case modding parts throughout the UK and Europe.
- http://www.tekheads.co.uk

DangerDen
- Manufacturer of watercooling kits, water blocks, radiators, reservoirs, tubing, and other watercooling equipment. Features news, forums, reviews, product catalog, instructions and sales.
- http://www.dangerden.com/

Swiftech
- Company which fabricates and sells watercooling equipment. Also provides pre-built watercooled systems to the end user.
- http://www.swiftnets.com/

Benchtest.Com
- Hobby site dealing with CPU watercooling. Several examples of home built watercooling equipment, as well as information on fabricating waterblocks, radiators and resevoirs.
- http://www.benchtest.com