Google's directory of ZX81 links. A comprehensive list of ZX81 sites and webpages.
Matt Barber's ZX81 Home Page. This site has links to ZX emulators, software
archives, ZX81 FAQs, and a continous vote on the most popular ZX games.
Planet Sinclair. FAQs, links to emulators and software, and a large amount of
information on all Sinclair products, the company, the industry, publications, and the
people involved. Very interesting, a must-see.
Dave Harrisons Retro Computing Construction Projects. Interesting articles on constructing robots and controlling devices using your ZX computer, amongst other useful info.
Matthew's ZX81-homepage. Software, including a lot of games.
ZX81-Web-Ring A new site in Germany, in English and German. Events, user groups, software and emulation, meetings, and more.
ftp://ftp.nvg.unit.no/pub/sinclair/zx81/ A large archive of ZX81 software.