TeX and LaTeX

CTAN

There are CTAN sites in Germany, England, and USA. The organisation of TEX files on all CTAN sites is identical and starts at tex-archive/.

TUG - TeX User's Group

The best way to get a complete TeX/LaTeX environment on your computer is to join the TeX User's Group (TUG) and get the TeX Live distribution that will set you up on MacOS, Windows, or Linux.