Comment by pmoriarty

org-mode in emacs supports tables, and it's ASCII-based.

Here's an example, displayed exactly how you would see it marked up in org-mode syntax in emacs:

  |-----+-------|
  | Key | Value |
  |-----+-------|
  |  00 | foo   |
  |  01 | bar   |
  |-----+-------|

org-mode can export to HTML, and many other formats.