18 Watts Community Center: All about small self-built or manufactured tube amps.
Axecity.com: Community with a forum, band profiles, reviews and news.
BeatGear Cavern: The BGC is about 1960s music, guitars, amplifiers, drums and other gear as well as pop culture including the Beatles.
Boogie Board: Discussing all Mesa Boogie amps, with an amp setting database for most of the models.
Carvin Museum Forum: About old and new guitars, basses and amps from this manufacturer.
Club McNaught: Forums for discussing guitars built by David Thomas McNaught.
Daion Guitar Community: A place to discuss anything related to Daion and Yamaki acoustic and electric guitars.
Dinosaur Rock Guitar Forum: A hardrock and heavy metal rock guitarist oriented forum.
Epifriends: Unofficial forum for Epiphone and Gibson guitar players.
Epiphone Forums: For customers and enthusiasts to share opinions and information about all of the brands in the Epiphone family.
ESP Guitars Message Board: Discussions about this Japanese manufacturer.
Fender Discussion Page: The FDP is a private site offering many different boards for all things related to the company.
Fender Forum: For enthusiasts for Fender guitars, also offers a gallery, artist profiles, news and lessons to download.
Fenderpick: Fender enthusiasts share their experiences, gear, and love of music.
GeekChat: Discussions about guitar and bass rigs of users and favorite artists.
Gibson Forums: For customers and enthusiasts to share opinions and information about all of the brands in the Gibson family.
Gibson-Talk.com: Offering discussion boards for the complete Gibson guitar range including Epiphone models.
Gibsoncustom Forums: Official manufacturer forum for special interest questions about their custom shop models including the Historic Reissues.
Guitar Board: Guitar related discussion board also offering a Wiki.
Guitar Brain: An independent forum offering advice on playing techniques, which guitar to buy, which sites to visit etc.
Guitar For Beginners & Beyond: For all guitarists whether they are just beginners or have been playing for a long time.
Guitar Forum: Guitarists' forum with "Gear Aquisition Syndrome" categorised links for instruments and amplification.
Guitar Gallery Forums: About the different brands coming from the Japanese manufacturer Matsumoku like Aria, Westone, Electra and others.
Guitar Player Magazine Forums: An open forum for guitar players to share their opinions and ask questions about guitars, guitar-related gear, tips for maintenance, and on learning how to play.
Guitar Trade: A forum for guitar and bass players, including basics, lessons, technical stuff, and general chat.
Guitar-Guitar.com: Includes guitar lessons, guitar chord generator, tablature, music news, forums, chat, and monthly articles.
GuitarGearHeads: Community focused on guitar and bass related gear reviews and product information. Site also includes guitar related on-line tools, member forums, and lessons.
Guitarworld: The magazine also provides a forum with many different boards.
Harmony Central User Forums: One of the crowdiest places for guitarists, but nevertheless interesting.
Hofner Hounds: Fans of the German manufacturer Höfner exchange information about vintage and new models.
Ibanez Collectors World: Discussion board, gallery and further links for fans of this Japanese manufacturer.
Jackson / Charvel Forum: Discussion site for these manufacturers with chat and gallery.
Jam Session: Discuss guitar related topics with guitar players of all levels and styles at this moderated public forum.
Kramer Guitar Forum: For fans of these typical hardrock guitars.
Kronosonic: International Society for Creative Guitar and String Music, also offering interviews, reviews and articles.
Les Paul Forum: The LPF is an unofficial site dedicated to Gibson Les Paul and other Gibson guitars, also offers knowledgeable articles about vintage instruments.
LetsTalkGuild: A place for Guild enthusiasts.
Music Electronics Forum: The new "ampage" discussion site about building, modifying and maintaing musical electronic devices such as guitar amps and effects as well as pickups.
Online-Discussion Network: The ODN is a place for guitar aficionados to find discussions about artists, gear, and music. Hosts many different forums.
Ovation Fan Club: Online home for fans of Ovation acoustic and electric guitars.
Project Guitar Forum: General discussions about working on guitars.
Rickenbacker Forum: Offering many sections about vintage and new instruments, technical info or famous players.
Rig-Talk: Discussions, reviews and free classified ads about guitars, amps and effects. Official forums of Aiken, Diezel and Roccaforte amps as well as Gutierrez guitars.
Robin Lovers: Fans discussing the different models of the guitar manufacturer from Houston, Texas.
Seymour Duncan User Group Forums: The pickup manufacturer provides an open discussion place not restricted to their own products.
Sputnik Music and Musician Forums: Discuss music and gear, write your own reviews, and rate your albums. Very large board with emphasis on guitar topics.
Steinberger World: Yahoo! group for fans and players of the innovative Steinberger guitars and basses.
Strat-Talk: Discussing the Stratocaster with free user blogs, galleries, links and reviews.
Telecaster Discussion Page Reissue: The TDPRI is a forum for guitar players who appreciate the Telecaster and Fender's other great guitars, also offers free picture uploads.
The Fender Forum: TFF is serving Fender guitar and amp enthusiasts worldwide.
The Fret.Net: A friendly forum for guitar and bass players of all ages and abilities, also offers free user uploads within a reasonable file size.
The Gear Page: TGP is one of the biggest internet communities about guitars and related gear, e.g. luthiers or effect boards.
The Guitar Refinishing and Restoration Forum: Hosted by the Guitar ReRanch.
The Guitarists Network: A forum for guitarists; also includes links to a variety of guitar-related resources and lessons.
The Jacaranda Club: For fans of the Beatles and their guitars.
The Marshall Amp Forum: Everything about old and new amps from this British manufacturer, also about other gear.
Thorn News and Discussion Page: Community created by and for fans and friends of Thorn Custom Guitars and Inlay work.
Tokai Forum: Fan community of this Japanese manufacturer with different boards like "Vintage" or "Ebay alerts", also about other Japanese brands like Burny, Orville or Greco.
Ultimate-Guitar: Forums dedicated to guitar enthusiasts. Cover electric, acoustic, guitar gear and accessories topics.
Univox Forums: Discussing guitars and other products of this Japanese manufacturer.
Vintage Amps Bulletin Board: Formerly known as the Plexi Palace, offers many boards for different amp manufacturers.
VintAxe Guitar Forum: About unusual vintage instruments.
Vox Talks: Vox Talks is a sign-in forum intended for VOX related topics.
Westone Guitars: Discussions about the different models of this Japanese brand manufactured by Matsumoku.
WestoneClassics: Yahoo! group for owners and collectors of these instruments.