Heytools - JavaScript tools, AJAX tools and some fully server side tools.
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
WordCounter.net - Count words, sentences, paragraphs etc.
XMLStarlet - XMLStarlet Command Line XML Toolkit
NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.
xmllint - command line XML tool