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Re:TeX Live 2014 by Derbasti on Thursday June 19, 2014 @01:33AM (#7914613)
Pdflatex is a rewrite that compiles directly to PDF.

Xetex is a rewrite that supports Unicode and TTF/OTF fonts.

Luatex is a rewrite that supports Unicode and TTF/OTF fonts and is scriptable in Lua.

Re:TeX Live 2014 by Derbasti on Thursday June 19, 2014 @04:51AM (#7915239)
Oh, I forgot: LuaJitTex is a descendant of LuaTex that uses LuaJit to compile.