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The official companion web site of Nand2Tetris courses
And of the book The Elements of Computing Systems, MIT Press, By Noam Nisan and Shimon Schocken

The site contains all the software tools and project materials necessary to build a general-purpose computer system from the ground up. We also provide a set of lectures designed to support a typical course on the subject.

Well Jack Eisenmann has done it again with a nifty little 1-instruction CPU he's put together. The 1-instruction has a number of operands and the CPU has a few registers including an output register (LEDs) and an input bus so it can actually do something useful. Check it out and have a look at the Youtube clips of it operating. It's pretty cool. 

How cool is this? A 4-Bit CPU based on the Galactic 4-Bit CPU but built using transitors and diodes.

All right...This link goes to a single bit processor concept. After some consideration, I don't consider this purely as a single bit CPU but it is interesting and should be pretty simple to build in TTL with a little RAM. The ALU would just be a comparator. I may try and build one just for fun.

Here's a great online resource for anyone who's serious about learning about electrical and computer engineering. MIT provides all of the course materials online and free. The section on Computational Structures is particularly interesting to anyone planning to build a scratchbuilt CPU or computer. [link]

This is as basic as you can get with computing yet towards the bottom of the page the TIM computers become more and more advanced to the point of supporting a relay based sound card and a paper tape reader for loading programs. This is bare metal computing.

This isn't a scratchbuilt TTL CPU but it is pretty cool none-the-less. This is a link to Quinn Dunki's Blog where she's building and documenting her scratchbuilt 6502 8-Bit computer. Lot's of solderless breadboarding, wires, chips, troubleshooting and trial and error goodness! 

this is a page of links to some projects that a fellow by the name of Dave Feinberg has been involved in. One of them is a 4-Bit computer called CHUMP. The collection of documents are really interesting for anyone who is looking to build their own cratch built CPU.