Hackaday relay projects

YGREC16 - YG's 16bits Relay Electronic Computer https://hackaday.io/project/18757 (superseded by #YGREC-РЭС15-bis)
SPDT16: 16-bits arithmetic unit with relays hackaday.io/project/10889 (superseded by the above project)
Kalin-Burkhart Logical Truth Calculator hackaday.io/project/7871 (project vanished ?)
4 bit relay adder hackaday.io/project/3802
RISC Relay CPU hackaday.io/project/11012
Simple Relay ALU https://hackaday.io/project/162246-simple-relay-alu
Relay Puzzle Box hackaday.io/project/2075
Swifty's Relay Clock Project https://hackaday.io/project/55956
Relay Logic Clock hackaday.io/project/8683
Relay Computer hackaday.io/project/10303
RelayRepRap https://hackaday.io/project/11914-relayreprap
Brainfuck relay computer https://hackaday.io/project/18599-brainfuck-relay-computer
4 bit relay adder https://hackaday.io/project/3802-4-bit-relay-adder
4-bit Relay ALU (РЦВМ-1) https://hackaday.io/project/159308-4-bit-relay-alu-1
RELAY COMPUTING https://hackaday.io/project/163254-relay-computing
R200 Relay Computer https://hackaday.io/project/160710-r200-relay-computer
Super Micro Relay Computer https://hackaday.io/project/167895-super-micro-relay-computer

Relay projects on other sites

Harry Porter's Relay Computer web.cecs.pdx.edu/~harry/Relay (see the video )
i² (i Squared isquared.weebly.com
Basic relay computer electronixandmore.com/projects/relaycomputer
Relay Computer Two electronixandmore.com/projects/relaycomputertwo
RC-3 computerculture.org/projects/rc3
Zusie www.nablaman.com/relay YouTube: https://www.youtube.com/channel/UCxTUNOQS56cvNHgRD5bKMsg
Mercia relaiscomputer.nl
Relay calculator simonwinder.com/projects/relay-calculating-engine (broken) YouTube video of the square rooting machine : https://www.youtube.com/watch?v=gI8luQnyM9A (2014)
Paul Laws's Relay Computer relaycomputer.blogspot.my moved to https://relaycomputer.co.uk/
Clicks clicksrelaycpu.blogspot.my
A fistful of relays github.com/Dovgalyuk/Relay/wiki/Build-log
Radiolok rln.nnov.ru/index.php github.com/radiolok/RelayComputer2 tqfp.org/radiolok/releynaya-evm-versiya-2-releynaya-logika-alu
TIM series northdownfarm.co.uk/rory/tim
Duo 14 Premium ostracodfiles.com/ostracod/relay.html
R500/7T strangecalc.ch Youtube : https://www.youtube.com/watch?v=67jLony0mXg
Simon relay processor cs.ubc.ca/~hilpert/e/simon
Relay Trainer relaysbc.sourceforge.net
Relaiscomputer relaiscomputer.de/pr.htm
Relaisrechner schlaefendorf.de/relaisrechner/dokumentation
4-Bit Relay Adder brainlubeonline.com/relaycomputer/RelayFramer.html
Neodem ALU/Computer neodem.com/.../relay-computer
TD4 with relays http://www.geocities.jp/team_zero_three/TD4/
Relay Computer http://www.xpl0.org/rr6/