ZX81 Download Page  
   A ZX81 software archive.
   http://www.zx81.nl

Matthew's ZX81 Homepage  
   Software library, reviews, news, emulators for various platforms.
   http://www.hh.schule.de/hhs/mjaap/zx81.htm

ZX81 Virtual Community  
   Contains links, a scanned copy of the ZX81 manual as well as ZXTAPE, a DOS-based utility to transfer ZX81 software from a PC to a ZX81 or tape recorder, and to transfer ZX81 software from tape back to PC.
   http://www.geocities.com/SiliconValley/Ridge/9965/index.html

Kevin Baker's ZX81 Page  
   Page with support files for Sinclair ZX81 and Timex TS1000/TS1500.
   http://edge.edge.net/~krbaker/zx81.html

System Variables of the Sinclair ZX81  
   Memory map of the RAM reserved by the system.
   http://www.penelope.demon.co.uk/zx81/sysvars.html

Project 81  
   Aims to preserve ZX81 related documents in digital form.
   http://www.hh.schule.de/hhs/mjaap/project.htm

ZX-TEAM  
   A very active german Sinclair ZX81 users group.
   http://www.zx81.de/

Steven's ZX81 Computer  
   Links and information from an enthusiast.
   http://www.geocities.com/CapeCanaveral/Hangar/1969/zx81/

ZX81 Stuff  
   Collection of ZX81-related documentation plus hardware and software projects.
   http://www.howell1964.freeserve.co.uk/ZX81/ZX81.htm

ZX81 Home Page  
   A ZX81 FAQ, emulator and software links.
   http://www.honneamise.u-net.com/zx81/

Zebra Systems, Inc.  
   Timex-Sinclair ZX81 computer kits for sale.
   http://www.zebrasystems.com/zebrasystems/zx81/index.html

ZX-180  
   A modern version of the ZX80, ZX81 for the home hobbyist builder.
   http://opendesign.cx/ZX180.htm

Sinclair ZX-81 back from the dead  
   Tony Smith writes about the availability of ZX81 DIY kits.
   http://www.theregister.co.uk/content/archive/13785.html

ZX81 - Planet Sinclair  
   Information, photos and resources for the Sinclair ZX80, including a detailed account of its development extracted from Ian Adamson and Richard Kennedy's book "Sinclair and the Sunrise Technology".
   http://www.nvg.org/sinclair/computers/zx81/zx81.htm

The ZX97 by Wilf Rigter  
   A project to design and build an enhanced, low power discrete logic version of the ZX81.
   http://www.howell1964.freeserve.co.uk/ZX81/ZX97.htm

Sinclair ZX81 Benchtest  
   Article from Personal Computer World by David Tebbutt.
   http://www.nvg.ntnu.no/sinclair/computers/zx81/zx81_pcw0681.htm

Rodney Knaap: Build your own ZX81  
   ZX81 hardware website featuring a project for building your own ZX81 with discrete components as well as Wilf Rigter's ZX97. In English, Dutch and German.
   http://www.angelfire.com/ab6/rodneyknaap

Sinclair ZX81 FAQ  
   Some common questions about the ZX81.
   http://www.honneamise.u-net.com/zx81/zx81faq.html

ZX81 CD Game Collection  
   Suppliers of ZX81 games and emulators on CD, enabling you to reproduce the ZX81 on your Windows PC.
   http://www.cd-r-direct.co.uk/ZX81.htm

Obsolete Computer Museum's ZX-81 Page  
   Technical specifications and pictures of the Sinclair ZX81 with comments from other ZX81 owners.
   http://www.obsoletecomputermuseum.org/zx81/

ZX81 'Caverns' Game - PC Remake  
   Author of the original 1980's 'Caverns' game offers a PC remake for download. Includes game history and instructions.
   http://www.users.globalnet.co.uk/~mart03/zx81.htm

ZX81Kit .Com  
   A European supplier of the classic Sinclair ZX81 computer in Kit form.
   http://www.zx81kit.com

ZX80 hardware page  
   How to build your own ZX80 and ZX81.
   http://home.micros.users.btopenworld.com/zx80/zx80.html

ZX81 Forever  
   Pictures, newsletters and programs made with the ZX81, a 16kb rampack and a Timex 2040 printer. Updated monthly.
   http://www.zx-team.de/andre

Sinclair ZX81 Collection  
   List of software titles including photos and year of release.
   http://zx81.atspace.com

ZX81 kit  
   UK based sales and support of ZX81 computers in kit form, also related peripherals and books.
   http://www.zx81kit.co.uk