| alchemist:research | | An organisation covering many topics, but mainly a Sinclair user group. |
| Home Electronics Service | | Service, hardware and software providers for Sinclair QL and Z88. Located in San Antonio, Texas, USA. |
| 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. |
| Sinclair Archaeology | | Details of Enrico Tedeschi's comprehensive collection of Sinclair memorabilia, dating back more than 40 years. |
| 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. |
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