A quick note about the links: The operators of the linked sites are solely responsible for their content!

General information about Sinclair computers

• https://www.nvg.ntnu.no/sinclair - Planet Sinclair archive, showing many developments and products from Sinclair (not just computers)
• https://www.worldofspectrum.org - The official world archive for the ZX Spectrum: software, hardware, documentation
• https://spectrumcomputing.co.uk - Another software archive for the ZX Spectrum and a forum section
• https://8bit-wiki.de - Database for 8-bit based computers and home computers
• https://problemkaputt.de/zxdocs.htm - Sinclair ZX specifications, contains a collection of many specific information about Sinclair computers

Sinclair hardware

• http://www.fruitcake.plus.com - Lots of information about the ZX80, ZX81, ZX Spectrum 128k, ZX Interface 2 and ROM cartridges
• https://velesoft.speccy.cz/zx/divide - The unofficial page about the DivIDE interface
• https://velesoft.speccy.cz/zx/divide/divide_plus/divide_plus.htm - The page about the DivIDE Plus interface
• https://z00m.speccy.cz - z00m's speccy corner: Lots of information about Spectrum computer (software, hardware, documentation)
• https://www.specnext.com - Homepage of the ZX Spectrum Next, information, forum and shop

Sinclair software

• https://www.esxdos.org - The homepage of ESXDOS
• http://spc.gmc-clan.de/downloads2 - PD software archive for ZX Spectrum and SAM Coupé
• https://itch.io/search?q=sinclair - Games and software platform for all systems, filtered selection for Sinclair computers
• https://www.biehold.nl/rudy - Software pages by Rudy Biesma: Complete Disciple/+D Disassembly, +DivIDE Firmware
• https://zxdemo.org - Demotopia, a large collection of ZX Spectrum demos and a calendar of demo parties
• https://simonowen.com - Software for ZX Spectrum and SAM Coupé, here you can also find SamDisk, which the +divide Manager needs to access Plus-D disks
• https://github.com/UzixLS/zx-midiplayer - Great MIDI file player for the ZX Spectrum 128k

Other sites about Sinclair and Z80 computers

• https://www.joyce.de - Information centre of the Joyce User AG e.V.
• https://www.basicode.de - Information about BasiCode, BasCoder for many computers and BasiCode programs
• https://www.zock.com - 8-Bit-Nirvana, information about many 8-bit systems and video games
• http://www.retroarchive.org/cpm - Commercial CP/M software, many CP/M programs for download
• http://www.cpm.z80.de - The Unofficial CP/M Web site, lots of information about CP/M and software

Sinclair hardware and software resellers

• https://www.sintech-shop.de - Offers a wide range of hardware and software for Sinclair and other computers
• https://www.bytedelight.com - Wide range of interfaces and spare parts for the ZX Spectrum
• https://www.rwapsoftware.co.uk/spectrum.html - Offers many Sinclair computers and related hardware
• https://www.sellmyretro.com - Sales platform for retro computers and accessories
• https://www.tfw8b.com/sinclair-zx - Hardware and software for retro computers, DivMMC Future

Sinclair computer emulators

• http://www.cspect.org - CSpect - Emulator for all Spectrum models, including the ZX Spectrum Next
• https://specemu.zxe.io - SpecEmu - Emulator for all Spectrum models and some similar machines
• https://www.spectaculator.com - Spectaculator - Versatile Spectrum emulator, also available for iOS and Android
• https://fuse-emulator.sourceforge.net - Fuse - Spectrum emulator for many PC platforms
• https://github.com/chernandezba/zesarux - ZEsarUX - Emulator für viele Retro-Computer auf Z80-Basis
• https://rodrigorc.github.io/raze - R.A.Z.E. - Web browser emulator for ZX Spectrum and ZX Spectrum 128k

Forums for Sinclair computers

• https://forum.tlienhard.com - German forum for ZX80, ZX81, ZX Spectrum, Sinclair QL, Sam Coupé and Commodore Amiga
• https://spectrumcomputing.co.uk/forums - UK forum for ZX Spectrum and other Sinclair computers
• https://www.specnext.com/forum - UK forum for the ZX Spectrum Next
• https://zx-pk.ru/forum.php - Russian forum for ZX Spectrum and compatible computers