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There has already been a question on where to find the source code for pdfTeX. The answer is that it can be found on CTAN, in the systems directory.

Unfortunately, the source code for XeTeX is not there. Where can I find the source code for XeTeX?

It would be interesting to provide links to the source codes of all major engines in the answer, to make it easier to access them.

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@PauloCereda Please post this (and preferably links to the LuaTeX and pdfTeX source codes too, even if the latter is a bit redundant with my question) as an answer. – Bruno Le Floch Aug 1 '12 at 19:03
related: historical versions of packages – matth Aug 7 '12 at 10:57
up vote 11 down vote accepted


Source code: Download http://ctan.org/tex-archive/systems/pdftex/


Homepage: Homepage http://xetex.sourceforge.net/

Source code: Download http://sourceforge.net/p/xetex/code


Homepage: Homepage http://luatex.org/

Source code: Download http://foundry.supelec.fr/gf/project/luatex

Friends, feel free to add more links if necessary.

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It would be nice to find a place to browse the pdfTeX source code directly. – Bruno Le Floch Aug 1 '12 at 19:33
@Bruno: Indeed. I'd vote for a BitBucket/GitHub mirror. :) – Paulo Cereda Aug 1 '12 at 19:35

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