Cubulus is an analytic engine and a slice and dice Web interface on top of a relational database (MySQL, PostgreSQL, SQLite, and MonetDB at the moment). It caches calculated cells and is able to parse basic MDX queries, with a maximum of two dimensions cross-join on rows and/or on columns. It includes hierarchical charts: the vertical boxes represent hierarchy "on rows", and horizontal boxes represent data sets "on columns" scaled to the "on rows" measure.
grapcha is a captcha generator based on Graphviz. It produces diagrams that are big and easy to read by humans but hard to break with bots. A person reads the diagram by starting at the green "diamond" and stopping at the red "square", while ignoring the eventual random padding at the beginning and end for short texts.