This was created as a proof of concept for a talk I gave, called An Introduction to Gensim: Topic Modelling for Humans.
It is fairly experimental and rough. Feel free to fork and improve.
Visularity does not come with any of the data needed to do similarity comparison (e.g., transformation models and dictionaries). This data is generally application-specific and also large (think hundreds of megabytes). Visit http://radimrehurek.com/gensim to learn how to generate data. It's not that hard.