I ran across this graphic in this article, The Data Science Ecosystem: Preamble, by Lukas Biewald, posted on the Open Data Science (ODSC) site.   This lays out SOME of the ecosystem out there, and I like the way Lukas divides the ecosystem up nicely into components.  I would comment that there is a lot left out about what Python and R can do in the Enrichment, ETL/Blending, Data Integration, Insights and Models sections.  But overall I like the graphic.