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Sinclair ZX81

ZX81 Software, Books and Hardware Collection
(http://www.zx81stuff.org.uk/)
Raccolta di software e altro materiale relativo al Sinclair ZX81, curata da Simon Holdsworth. Ospita anche l'emulatore JtyOne.

ZX81 Download Page
(http://www.zx81.nl/)
Sito ricco di materiale scaricabile relativo al Sinclair ZX81.

Bukster games
(http://bukstergames.bizhat.com/)
Games for the Sinclair ZX81 and PC compatable computers.

Bob's Stuff
(https://bobs-stuff.itch.io/)
ZX81, ZX Spectrum, and mobile games written by bedroom/sofa-coder Bob Smith.

The Perfectly Normal Site
(http://perfectlynormalsite.com/)
ZX81 hardware and development, all you need to write HiRes games on a real ZX81.