Antiques   hallmarks/maker’s marks/silver marks encyclopedia
   AADLA   antiques/fine arts organization
   ACMOC   Antique Caterpillar Machinery Owners Club
   Antique Radios   vintage radio collecting
   Antiques and the Arts   antiques/arts trade
   Antiques Trade Gazette   antique/art news
   ASCAS   antique silver collectors association
   Atwater Kent Radio   Atwater Kent radios information   washing machines   carpet encyclopedia
   DATAMP   American machinery/tool patents directory
   EnginAds   advertising pages for antique engines
   Farm Collector   vintage farm equipment
   Friends of Ferguson Heritage   Harry Ferguson tractors   antique Chinese/Japanese porcelain

   InstAppraisal   antique/art/collectible appraisals
   ISRM   slide rules   carpets/rugs
   Kovels   antique/collectibles price guide
   Library of Congress   research library   crystal/tube radios   tractor forums
   Nostalgia Air   antique/vintage radio references   old engines   antique/used woodworking tools   Philco radios
   Phil’s Old Radios   antique radios
   Preston Services   steam engines suppliers
   Prices4Antiques   antiques/collectibles auction prices database
   Red Star Radiosite   Soviet antique radio gallery

   RedSquare   Wheel Horse forum   antique rugs/carpets/textile arts marketplace
   Scott Antique Markets   antique show
   Shorpy   vintage photography blog   antique silver collection
   Smokstak   antique engines
   TEFAF   antiques/art/design fair
   The Ferguson Club   Ferguson tractor owners club
   The Textile Museum   textile museum
   The Typewriter Database   typewriter serial number information
   The Valve Museum   valves
   The Valve Page   vintage televisions/tube radios collection   Stoke-on-Trent potteries
   TMC   textile museum
   Tractor Forum   online tractor community/resource

   Tractor Shed   antique/vintage tractors
   Vacuumland   vacuum cleaners   phonographs
   Vintage Tractor Engineer   vintage tractor maintenance/repair tutorials
   Yesterday’s Tractors   antique tractor parts


   Audio Geek Zine   music production articles
   Audio Ideas Guide   hi-fi/home theater magazine
   Audiofanzine   music gear news/reviews
   Audioholics   online audio/video magazine
   Audiokarma   home audio stereo discussion forums
   Audiophilia   online audiophile journal   home music production tutorials
   AudioReview   audio component review site   audio/video hardware archive
   Chris VenHaus   DIY resource for audiophiles
   Classic Speaker Pages   classic speakers information
   DIY Audio Projects   DIY audio project collection
   DIY Audio Projects   DIY audio blog   subwoofer DIY   audiophile equipment reviews   pro audio community
   Head-Fi   headphone news/reviews   KEF speakers forum/information
   Home Brew Audio   audio recording lessons
   Home Studio Corner   music production tutorials   music recording forum
   Hometracked   home recording/project studio blog
   Humble Homemade Hifi   loudspeaker projects   tube amplifier projects
   LA Audio File   audio equipment reviews
   Lansing Heritage   history of audio engineer James B. Lansing   MiniDisc community portal   Nakamichi cassette deck resource
   Pass DIY   amplifiers/loudspeakers/preamplifiers projects
   Positive Feedback   audio arts forum

   Pro Audio Files   tutorials on mastering/mixing/producing music
   Production Advice   music production advice
   RecordingHacks   audio recording news
   Remote Central   universal remote control reviews
   Roger Russell   information/photos of McIntosh equipment   Sansui classic audio/vintage stereo information
   Sonic State   music technology news/reviews
   Stereo Times   audiophile magazine
   Stereophile   high-end audio magazine   subwoofer DIY   transmission line speaker information
   The Analog Dept.   vinyl LP hardware information
   The Big Picture   music production blog
   TNT-Audio   hi-fi audiophile magazine   audio/music magazine

   Tuner Information Center   vintage stereo tuners information
   UCSB Cylinder Audio Archive   cylinder recording archive
   UHF Magazine   high fidelity magazine
   Zaph Audio   DIY speaker projects


   Acura   luxury vehicle manufacturer
   Audi   luxury vehicle manufacturer
   Audi USA   luxury vehicle manufacturer
   AudiWorld   Audi forums/news
   Autoblog   car news/reviews   online automotive catalog
   autoevolution   automotive news/car reviews
   Autoweek   car culture magazine
   BMW   luxury/performance vehicle manufacturer
   BMW USA   luxury/performance vehicle manufacturer
   Car and Driver   automotive enthusiast magazine
   CarBuzz   car news/reviews
   Carscoops   car news
   Chevrolet   automobile manufacturer
   Chrysler   automobile manufacturer

   ClubLexus   Lexus forums/news
   Dodge   automobile manufacturer
   Ford   automobile manufacturer
   General Motors   automobile manufacturer
   GMC   truck/utility vehicle manufacturer
   Honda   automobile/motorcycle/power equipment manufacturer
   Honda Automobiles   Honda automobile sales information
   HowStuffWorks Auto   explanations of auto accessories/equipment/parts
   Hyundai   automobile manufacturer
   Jaguar   luxury vehicle brand
   Jalopnik   automotive culture/car news
   Jeep   off-road/sport utility vehicle manufacturer
   Lamborghini   luxury sports car manufacturer
   Lexus   luxury vehicle manufacturer
   Mercedes-Benz   luxury vehicle manufacturer

   Motor Authority   auto news
   Motor Trend   automobile magazine
   NASIOC   North American Subaru Impreza Owners Club   car pictures/wallpapers
   NHTSA   National Highway Traffic Safety Administration
   Nissan USA   automobile manufacturer
   Peugeot   automobile manufacturer
   Popular Mechanics   popular science/technology magazine
   Porsche   high-performance sports car manufacturer
   Renault   automobile manufacturer   Porsche enthusiast site
   Road & Track   automotive enthusiast magazine
   Speedhunters   car tuning weblog
   Subaru   automobile manufacturer
   Suzuki   automobile/motorcycle manufacturer

   The Car Connection   car review site
   Top Gear   automobile magazine
   Volkswagen   automobile manufacturer
   Volvo   Swedish luxury vehicles company
   Vwvortex   Volkswagen enthusiast website


   Aero-News Network   aerospace/aviation news
   Aeromodelling GR   aeromodelling in Greece
   AIN   Aviation International News
   Air & Space   aviation/flight technology magazine
   Air Sports Net   aviation news/weather   reference site for aircraft/airline fleets
   Airliners   aircraft photo database/aviation forum
   AOPA   Aircraft Owners and Pilots Association
   AvCom   aviation discussions
   Aviation Week   news service for aerospace/aviation/space industries
   Avionics   avionics industry analysis/news
   AVweb   aviation news   Boeing 737 Technical Site
   BALPA   British Airline Pilots’ Association
   Boeing   aerospace/defense company

   CAA   Civil Aviation Authority   Chinese civil aviation web portal
   CASA   Civil Aviation Safety Authority
   Cessna   general aviation aircraft manufacturer
   Cirrus Aircraft   aircraft manufacturer
   Cross Country   hang gliding/paragliding/paramotoring magazine
   DGCA India   national civil aviation authority of India
   DHV   German hang gliding/paragliding association   skydiving community
   EAA   Experimental Aircraft Association
   FAA   Federal Aviation Administration
   FAI   World Air Sports Federation
   Flightradar24   global flight tracking service   highlight
   FLYER   general aviation magazine
   General Aviation News   newspaper covering general aviation

   Heliguy   drone retailer in UK   homebuilt aircraft discussion forum
   ICAO   International Civil Aviation Organization
   Kent Gliding Club   gliding club in UK   live audio feeds of air traffic communications
   MiGFlug   aviation/space adventure company
   MILAVIA   military aviation website
   NAV CANADA   Canada’s air navigation service provider
   NTSB   National Transportation Safety Board
   Plane & Pilot   information source for general aviation pilots   civil aviation database   radio-controlled model articles/forums/market
   Red Bull X-Alps   paragliding race
   Royal International Air Tattoo   military air show
   SACAA   South African Civil Aviation Authority

   Skydive Arizona   skydiving center
   Skydive Perris   skydiving center
   SkyVector   aeronautical charts/flight planning
   Trade-A-Plane   aviation marketplace
   XContest   online hang gliding/paragliding contest


   10,000 Birds   birding blog
   ABA   American Birding Association
   ABA Birding News   birding news
   ABC   American Bird Conservancy
   ABC   African Bird Club
   All About Birds   bird guide
   Bird Watcher’s Digest   birding magazine
   BirdForum   online birding community
   BirdGuides   bird news
   BirdLife Australia   bird conservation/research organisation in Australia
   BirdLife Switzerland   bird conservation group in Switzerland
   BirdNote   podcast/radio show about birds
   Birds of North America   encyclopedia of bird species in Canada/US   birding website
   BOU   British Ornithologists’ Union

   British Bird Lovers   information about bird watching/garden birds in UK
   British Garden Birds   British garden bird guide
   BSC   Bird Studies Canada
   BTO   British Trust for Ornithology
   Carolina Raptor Center   raptor conservation organization
   Cornell Lab of Ornithology   bird conservation/research institute
   Ducks Unlimited Canada   waterfowl habitat conservation organization
   Dutch Birding   ornithological magazine
   eBird   online database of bird observations
   Fugle og Natur   Danish nature site   birds/wildlife photography
   HKBWS   Hong Kong Bird Watching Society   online resource about hummingbirds   North Carolina Wildlife Resources Commission
   NestWatch   nesting bird monitoring program

   OBI   Oriental Bird Images
   Operation RubyThroat   website about attracting/studying hummingbirds
   Optics4Birding   bird watching equipment store   French birdwatching/ornithology website
   RSPB   Royal Society for the Protection of Birds
   Rutland Ospreys   Rutland Osprey Project online
   Scottish Seabird Centre   seabird conservation/education charity   information/photographs about South Dakota birds
   Sialis   information about bluebirds
   Sibley Guides   identification of North American birds/trees
   Skye Birds   Skye birding guide
   SOS   Sussex Ornithological Society   wildlife rehabilitation organization in Newark
   Tucson Audubon Society   bird conservation organization in Arizona
   USGS PWRC MBR   North American bird population change information   bird identification guide
   Wildlife Acoustics   bioacoustics monitoring systems
   WWT   wetland/wildfowl conservation charity in UK
   xeno-canto   bird sound database


   470 Sailing   International 470 Class Association
   ANSA   Annapolis Naval Sailing Association
   ASA   American Sailing Association
   Boat   superyacht guide   boating education courses   boat building/design site   online boating safety courses/exams
   Boating   powerboat magazine   boat reviews/tests
   BoatUS   American association of boat owners
   BSC   Budworth Sailing Club
   Canal & River Trust   charity responsible for maintaining waterways in England and Wales
   Cannes Yachting Festival   boat show
   Crewseekers   sailing yacht crew agency
   Cruising World   sailing magazine

   Equasis   Electronic Quality Shipping Information System   international online boat/crew network
   iBOATS   boating forum
   Latitude 38   sailing magazine for Northern California
   Le Boat   boating vacation company
   Locaboat Holidays   canal boat hire in Europe
   Mariners’ Museum   maritime museum   planning site for cruisers
   OARS   adventure travel company   International Optimist Dinghy Association
   ORC   world governing body for offshore sailboat racing
   PassageMaker   cruising magazine
   Power & Motoryacht   magazine for powerboat owners
   Practical Boat Owner   British yachting magazine
   Practical Sailor   boats/sailing gear reviews

   PWCToday   personal watercraft discussion forum
   RYA   Royal Yachting Association
   Sail   sailing magazine
   Sail-World   sailing news network
   Sailing Anarchy   sailboat racing e-zine
   Sailing World   performance sailing magazine
   Saône Bateaux   houseboat rental in Burgundy, France
   Scream And Fly   performance boating online community/magazine
   SCYC   South Caernarvonshire Yacht Club
   SpinSheet   Chesapeake Bay sailing magazine
   USPS   nonprofit educational boating safety organization
   Whitewater Guidebook   information about whitewater kayaking/rafting
   Wilderness Aware Rafting   Colorado whitewater rafting trips
   Wildwater   rafting/ziplining in southeastern US
   World Sailing   world governing body for sailing

   Yachting World   sailing/yachting magazine   sailing news   motorboating/yachting news
   Zoar Outdoor   rafting/ziplining in New England


   ACA   American Camp Association   American Camp Association, New York and New Jersey
   Adventure Treks   summer adventure camps
   Aloha Foundation   education programs/family camps/summer camps
   Alpengirl   teen summer adventure camps for girls
   ARCC   adventure travel programs/community service
   Bunk1   parent portal software to camps
   Camp Belknap   summer camp for boys
   Camp Billings   summer camp
   Camp Champions   summer camp
   Camp Courageous   recreational/respite facility
   Camp Good Days   residential summer camp for children with cancer
   Camp Lee Mar   special needs overnight summer camp
   Camp North Star   summer camp
   Camp Ondessonk   residential Catholic youth camp

   Camp Quality   children’s cancer charity
   Camp Robin Hood   summer camp
   Camp Shane   weight loss camps
   Camp Waldemar   summer camp for girls
   CampBrain   camp management software   summer camp
   CampMinder   summer camp management software
   Campwise   camp management software
   Cloverleaf Ranch   day/resident camp
   Crowe’s Nest Farm   summer day camp
   Ekocamp   English/French summer camp in Canada
   ESF   summer camps
   EXACT Sports   college exposure camps/ID clinics/recruiting camps   medically-supervised summer camps/programs
   iD Tech   summer computer camp   summer camp   camp directory
   Mountain Camp   summer camp
   Oak Crest Day Camp   summer camp
   Outward Bound   outdoor education programs
   Overland   summer trips
   Pali Adventures   summer camp
   RLT   teen summer travel programs
   SIG   academic summer programs
   SOAR   ADHD summer camps
   Space Camp   space camp
   Summer Discovery   pre-college enrichment programs
   SummerTech   summer coding camp for kids
   Summit Vision   indoor/outdoor adventure education
   Surf Camp   surf camps/lessons

   Trail Blazers   summer camp
   Ultimate Camp Resource   camp games/skits/songs
   Vista Camps   summer camp
   Westcoast Connection   teen travel
   Wilderness Adventures   teen adventure summer camps

Climbing   resource for climbing in Colorado   global climbing news
   AAC   American Alpine Club
   ACC   Alpine Club of Canada
   Access Fund   rock climbing advocacy group   climbing school/mountain guide service
   AMGA   American Mountain Guides Association
   BMC   British Mountaineering Council
   Boulders   climbing gym   mountain sports community   climbing centre in UK
   Climb Europe   hiking/rock climbing/walking in Europe
   Climbing   climbing magazine   canyoneering/mountaineering
   Earth Treks   climbing center

   Flagstaff Climbing   climbing gym
   Gripped   climbing magazine
   Guide Dolomiti   Dolomites guide
   Hangar 18   indoor climbing gym
   Hardrock   indoor climbing in Melbourne
   IMG   International Mountain Guides   Indoor Climbing
   MBA   Mountain Bothies Association
   MetroRock   climbing center
   Mountain Trip   mountain guide service   Russian climbing site   mountain weather forecasts
   NZAC   New Zealand Alpine Club   mountain peak database
   Peakware   world mountain encyclopedia

   Planet Granite   climbing gym   mountain magazine   outdoor portal in Russia
   RMI Expeditions   mountain guide company
   Rock and Ice   climbing magazine   Shasta Mountain Guides
   Sportrock   rock climbing gym   mountaineering website
   SuperTopo   rock climbing guide info
   T4C   climbing performance website
   The Mountaineers   nonprofit outdoor community
   theCrag   bouldering/rock climbing platform
   Touchstone Climbing   climbing gym
   UIAA   International Climbing and Mountaineering Federation
   UKC   climbing/mountaineering website

   Vertical Endeavors   indoor rock climbing gym   mental training for rock climbing   mountain adventure company/mountaineering school


   Absolut   vodka   Absolut Vodka advertising gallery/news
   Alibris   media marketplace‎
   Allnumis   banknotes/coins catalogs
   Badger & Blade   wet shaving community
   Banknote World   collectible banknotes/coins
   BoC   Bank of Canada
   Brickset   LEGO set guide
   Cardboard Connection   memorabilia/sports card resource
   CCF   coin collecting
   Coin World   coin collecting/numismatic magazine
   CoinArchives   searchable archive of past coin auctions   current melt value of coins
   Collectors Society   online community for collectors
   Colnect   collectables catalogs   highlight

   CPU-World   CPU collection
   Demco   products/services for libraries
   Department 56   holiday collectibles/giftware/ornaments
   EuroBillTracker   euro banknote tracking website   watch reviews/stories
   Hess Toy Truck   toy truck
   Hot Wheels   die-cast toy cars   The Museum of HP Calculators
   INMR   technical articles for power industry
   Jack Daniel’s   whiskey
   Jim Beam   whiskey
   Kellogg’s   food manufacturing company
   LEGO   construction toy
   Lladró   art porcelain figurines   Mint of Poland   Japan Mint
   Numista   catalogue of world coins
   Panini   trading cards
   Pepsi   soft drink
   PepsiCo   beverage/food/snack corporation
   Postcrossing   postcard exchange project
   PostSecret   community mail art project
   PSA   Professional Sports Authenticator   Star Wars collecting news   information on René Lalique and his works   Liberty Seated Dime
   The Pen Addict   pen review site
   The Royal Mint   mint in UK   information for watch enthusiasts
   Toys for Tots   USMCR program for less fortunate children   archive of trading cards
   TTPM   baby product/pet product/toy reviews
   uCoin   international catalog of world coins   United States Mint   G.I. Joe action figure database