Voyant Tools is an interesting tool for a text analysis of a text. It is very easy-to-use, pretty intuitive and offers several analytical possibilities for a researcher.
For example, it is possible to create a tag cloud of words. Moreover, it is possible to cluster words based on their appearance in the text. You may also see and compare the use of a set of words throughout the text (try to analyze the script for Pulp Fiction ;).
In this article, I would like to put your attention at the Gallery of examples. It contains many examples of real-life use of the tool for an analysis. Therefore, it is a very nice resource center for your future experiments.