Homepages of LaTeX software and editors
Like most software manufacturers and distributors, free and open source software projects offer information on their homepages.
LaTeX distributions
Today there are two big LaTeX distributions, both very modern and comprehensive, plus some descendants:
TeX Live: http://tug.org/texlive/ is a cross-platform LaTeX software collection. It runs on Windows, Mac OS X, Linux, and Unix.
MiKTeX: http://www.miktex.org/ is a very user-friendly and popular LaTeX distribution specifically for the Windows operating system.
proTeXt: http://www.tug.org/protext/ is a MiKTeX-based distribution for Windows that especially focuses on easy installation.
MacTeX: http://www.tug.org/mactex/ is derived from TeX Live and has been customized specifically for Mac OS X.
LaTeX editors
There are many LaTeX editors available, from easy-to-use to complex and professional.
Cross-platform
These editors support many systems including Windows, Mac OS X, Linux, and Unix:
TeXworks: http://tug...