TextMorph is an ASCII text editor (similar to Notepad) except it also does so much more.
It can quickly clean up forwarded emails (removing all those ">" signs and so forth), convert text to/from HTML, search/replace text (including mult. paragraphs), and much more. It can also repetitively do these tasks across large numbers of files. This makes TextMorph an ideal program for people who work with large numbers of text/HTML files.