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by kisonecat 1815 days ago
TeX's source code is available in a "literate" format, so you can download tex.web, run weave tex.web, and then pdftex tex.tex. This will produce a large book with the TeX source code. A challenge is that the resulting TeX engine won't support LaTeX3, so you'll need to use "changefiles" to modify tex.web to add epsilon-TeX and other updates.