All complete Linux distributions include LaTeX, typically the “texlive” version. Use the package manager of your distribution to search for “latex” and install the packages.
Editors
There are a large number of editors available that perform syntax highlighting or
that are tailored specifically for LaTeX. Do a Google search or examine the selected
ones on the local FTP site.
Postscript
Both 32-bit and 64-bit versions available for Windows, please select the one appropriate for your platform.