The Truthful Art has a couple of chapters discussing the virtues and shortcomings of different frequency charts, such as the
histogram, the
box plot, the
violin plot, and even the
strip plot.
Gerardo Furtado has just reminded me of another one, the
beeswarm plot*, which is similar to the strip plot, but disposes of dot overlap. See
this pretty example, and play with it. Aren't d3.js's animated transitions amazing?
(*Yes, there's
an R package to do beeswarm plots, too.)
UPDATE: Andres Snitcofsky
has asked if circles of the same color should be clustered together. The answer is yes, if it's possible.