Adam Schneider's Guitar Files: Chords and tablature for songs by varied artists. Includes guitar files, links and contact details.
Fretplay.com: A substantial collection of tabs for guitar (and some for bass), with discographies and CD reviews, and a forum.
Fretwired: An index of guitar tab listings for the Total Guitar and Guitar Techniques magazines [UK]. Listed alphabetically and by genre.
Guitar Pro Song Book: Several thousand tablatures, all in Guitar Pro format. Organised by artist and style.
Guitar Tab Universe: A large database of lyrics with chords and/or tablatures, searchable by artist or band name; also offers a forum and lessons.
iTabs.nl: An archive of several thousand tabs, organized by artist, in a variety of genres; includes a number of non-English singing European artists.
Jens Guitar Tab Archive: Modest collection of tabs, mostly rock and pop but including a few classical; also offers MIDI files.
Kabish: Several thousand lyrics with tablature and/or chords for guitar, categorised (including classical and acoustic).
OLGA - On-Line Guitar Archive: An online library of tablature for guitar, in various formats, with its roots in the newsgroups rec.music.makers.guitar.tablature and alt.guitar.tab.
Rimsky's Guitar Page: Tim Stoll's collection of tablature of some popular songs.
Tab Classics: A personal collection of the author's tabs, mostly of classic songs; includes a few arranged for acoustic fingerstyle guitar. Also offers a guide to using tablature.
The Guitar Tabalorium: Tablatures, lyrics and chords for a range of artists and bands, in varied genres.
The Tabworld.Com: Very large database of lyrics, tablature and chords; also includes a forum and reviews.
Ultimate Guitar Archive: A sizeable archive of tabs. Also has a forum, lessons and reviews.
Video Game Jam: Guitar tablature for video game music; also includes MIDI files.
Xclusive Guitar Tabs: Diverse, small collection all tabbed by the site owner, Frederic Maquet.