Computer scientist James A. Storer's puzzle site documents a huge collection of burrs, sliding-block puzzles, twisty puzzles, disentanglements, puzzle boxes, historical designs, solutions, measurements, makers, and references.
Richard R. Eckert's Binghamton University pages preserve the old academic-Web pattern: a professor homepage, résumé, course notes, examples, and teaching material living directly on a university server instead of behind a learning-management system.
Donald Knuth's Stanford homepage connects books, errata, papers, programs, music and personal oddities without flattening them into a modern academic profile.
A Boston University CS module first developed in 1995 walks from transistor switching to NOT, NAND, NOR, AND, OR and XOR using diagrams, truth tables and a faucet analogy.
UT Austin professor Gordon Novak's long-running academic homepage preserves decades of artificial-intelligence research, Lisp software, course notes, automatic programming systems and physics problem solvers in directly linked files.