emacs, the infinitely extensible text editor

Emacs has a mode for TeX and LaTeX, in which it will automatically produce smart quotes, match parentheses, close environments and generally demonstrate the superiority of free software.

Folding mode

Folding mode for emacs allows you to hide portions of a file to make it easier to read. It's similar to outline mode for Emacs or Word, but is more flexible.

You can get folding.el and find out more about Anders Lindgren's folding mode at the Emacs wiki.

Links

Explore the Emacs wiki.

See the WordCounts page for an emacs macro to count words.