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web2c: TeX extensions

 
 4.7 TeX extensions
 ==================
 
 The base TeX program has been extended in many ways.  Here's a partial
 list.
 
 e-TeX
      Adds many new primitives, including right-to-left typesetting and
      more registers.  Now frozen.
 
 Aleph
      This adds Unicode support, right-to-left typesetting, and more.
      Omega was the original program.  Aleph is an updated version with a
      variety of bug fixes, and includes e-TeX.  Aleph is not actively
      maintained.
 
 pdfTeX
      Can produce PDF as well as DVI files.  It also incorporates the
      e-TeX extensions, new primitives for hypertext and
      micro-typography, reading/writing from pipes, and much more.  Home
      page: <http://pdftex.org>.
 
 luaTeX
      Based on pdfTeX, this also embeds the Lua programming language
      (<http://lua.org>) and opens up the TeX typesetting engine to
      control from Lua.  Home page: <http://luatex.org>.
 
 XeTeX
      Combines support for Unicode input and OpenType- and system fonts
      with the capabilities of pdfTeX.  Home page:
      <http://tug.org/xetex>.
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