All major implementations (miktex, pdftex, xetex, luatex) are derivatives of Knuth's Pascal code. There are others, but they did not get very far: http://kaspe

All major implementations (miktex, pdftex, xetex, luatex) are derivatives of Knuth's Pascal code. There are others, but they did not get very far: http://kasper.phi-sci.com/tex++/ http://kasper.phi-sci.com/tex++/ http://www.cucug.org/amiga/amiinfo/reviews/AmigaTeX.txt http://www.cucug.org/amiga/amiinfo/reviews/AmigaTeX.txt