Many other TeX implementations are available in `CTAN:/systems', including ready-to-run distributions for Unix, Amiga, Acorn, VMS, Macintosh, DOS, and Windows (in various forms). Although Web2c has support in the source code for many operating systems, and in fact some of the other distributions are based on it, it's unlikely to work as distributed on anything but Unix. (Please contribute improvements!)
The Unix distribution alluded to above is the teTeX distribution. This includes both complete sources and precompiled binaries for many popular Unix variants, including Linux. It is based on Web2c, and contains many other TeX-related programs as well.
The host labrea.stanford.edu is the original source for the files for which Donald Knuth is directly responsible: `tex.web', `plain.tex', etc. However, unless you want to build your TeX library tree ab initio, it is more reliable and less work to retrieve these files as part of the above packages. In any case, labrea is not the canonical source for anything except what was created by Stanford TeX project, so do not rely on all the files available at that ftp site being up-to-date.
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