TeX: 1978 https://en.wikipedia.org/wiki/TeX https://en.wikipedia.org/wiki/TeX which is underlying the LaTeX set of macros and stuff that is still in use for a

TeX: 1978 https://en.wikipedia.org/wiki/TeX https://en.wikipedia.org/wiki/TeX which is underlying the LaTeX set of macros and stuff that is still in use for academic papers. [edit] Also TeX is a good example to bring up as an early example of a complex system that was intended to have freely available source code (before the term "open source" and before GNU). When he created TeX, Knuth said there was a lack of example source code that could be freely examined by students and others in the field, so he released the code and in fact published it in book form along with the source for Metafont and the code for the Computer Modern fonts.