- 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.
- The Sinclair MicroComputer Museum - Online gallery of Sinclair products, focusing mainly on the 1980s computers.
- Sinclair Archaeology - Details of Enrico Tedeschi's comprehensive collection of Sinclair memorabilia, dating back more than 40 years.
- alchemist:research - An organisation covering many topics, but mainly a Sinclair user group.
- 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.
- Home Electronics Service - Service, hardware and software providers for Sinclair QL and Z88. Located in San Antonio, Texas, USA.
- The Spectrum / ZX81 Technical Information Board - Web board for technical information about the ZX Spectrum and ZX81.
- Australian Sinclair User Group - An open and unmoderated discussion forum for Australian based users of Sinclair and related computers.
- Sinclair Computers - Retailers of used Sinclair computers.
- The Lil Old Sinclair Computer Technical Information Repository - Technical information concerning ZX Spectrum and ZX81, including instruction and service manuals, layouts and schematics.
- 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.
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