These files are regarded as basic for any TeX system, covering plain TeX macros, Computer Modern fonts, and configuration for common drivers; no LaTeX.
dvipdfmx -- An extended version of dvipdfm.
dvipdfmx-def -- Configuration file for dvipdfmx graphics.
dvips -- A DVI to PostScript driver.
etex-pkg -- E-TeX support package.
hyph-utf8 -- Hyphenation patterns expressed in UTF-8.
knuth-local -- Knuth's local information.
kpathsea -- Path searching library for TeX-related files.
luatex -- The LuaTeX engine.
makeindex -- Process index output to produce typesettable code.
metafont -- A system for specifying fonts.
mflogo -- LaTeX support for Metafont logo fonts.
pdftex -- A TeX extension for direct creation of PDF.
plain -- The Plain TeX format.
tex -- A sophisticated typesetting engine.
texdoc -- Documentation access for TeX distributions.