This tool lists words in an HTML document, either uploaded by the user or from a web address. List Words works with relatively small texts of under a megabyte in size. It is part of the TAPoRware collection of tools; there are XML and plain text versions ...
List Words - HTML (TAPoRware)
Voyant Document KWICs
Document KWICs shows a table of keywords in their context. In other words, it provides a list of certain keywords and their occurrence within a corpus or document.