So a question you will have from here!
Q: What is Mekko? A. Its like a histogram. The bar chart can show information in two axes. Normally in a bar chart the y axis shows the variation and x shows just categories/labels. Check Mekko Graphics
So my question is if there are any open source ways of getting these into Excel :)
Update: All the charts on Types of Mekko Charts but specifically the Bar-Mekko as shown here: