Planet Sinclair:Provides details of Sinclair's products from the 1960s to the present day, with a wide range of additional information about Sinclair software houses, personalities, magazines, and of course Sir Clive himself.
Home Electronics Service: Service, hardware and software providers for Sinclair QL and Z88. Located in San Antonio, Texas, USA.
Sinclair Archaeology: Details of Enrico Tedeschi's comprehensive collection of Sinclair memorabilia, dating back more than 40 years.
Sinclair Computers: Retailers of used Sinclair computers.
Sinclair Nostalgia Products: Site provides snapshots, MIDI files, screen savers, counter digits and information about a lot of hard-to-find clones of the Sinclair machines, focusing particularly on those from Eastern Europe and Russia.
SinTech Online-Shop: Dealer in hardware and software for Sinclair Spectrum and other 8-bit computers. Also the support-line for the ZX Spectrum User Club, Germany.
The Lil Old Sinclair Computer Technical Information Repository: Technical information concerning ZX Spectrum and ZX81, including instruction and service manuals, layouts and schematics.