- Planet Sinclair
- Online Sinclair-related archive featuring information on and images of Sinclair computers, calculators, televisions, vehicles, and audio hardware.
- QL Users and Tinkerers Association (QUANTA)
- Independent Sinclair QL users group. Site posts news, event dates, members resources, and information on subgroups.
- Sinclair ZX81 Collection
- Virtual showcase of original Sinclair ZX81 hardware, software, and related books and accessories.
- SUMO
- Presents archived copies of the Sinclair User, a Sinclair-centered magazine published from April 1982 through to April 1993.
- Timex Sinclair 2068
- Presents Sinclair software, technical specifications, notes, peripherals, and code and programming details.
- Your Sinclair Rock 'n' Roll Years
- Magazine dedicated to Sinclair computers offering issue archives, documentary, guides, photo gallery, and resource links.
- ZX81Kit.com
- Site dedicated to Sinclair ZX81 computer hardware and software. With photos, articles, instructions, and online manual.
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