Among other things, hackaday.io has the idea of collections - curated lists of projects. They are not always frequently updated, but they are good lists anyway. And, for the very determined digger, having a look at the home pages of the people who follow those lists might well show up more good projects and people.
Here are some examples:
Homebrew Computers 4 bit, 8 bit, tiny, micro, diy laptops, rebuilds, restorations & computers in a can
Hackaday TTLers Where DIY DIP/SSI/MSI CPU makers meet and discuss other TLA (three letters acronyms)
65xx ProjectsProjects using the 6502, 65816, and other related CPUs
Calculator Projects Crunch some numbers with the help of these projects
Retrogaming Hardware Hacks Retrogaming on real hardware! No Emulators needed.