I have 4 populations containing millions of bed intervals, each containing a different average G/C content. I would like to make something similar to a box or density plot. On the x-axis, I would simply have 4 categories (my four populations). On the y-axis, I would have GC content. For any given category/populations, I would like to show the G/C content for each of those millions of intervals within as separate points, or as a density cloud, as well as some kind of marker showing the average G/C content (normalized to base pair content). Can anyone recommend a simple program that I could use to accomplish this? I would prefer not to use R if possible, as I'm very clumsy with it.