Unlike the contributors analysis that asks which packages are most "loved" (or perhaps hated) by developer contributors, this visualization shows which contributors are loved by spack packages! For a total of 765 contributors to package files, you can mouse over any contributor to see the names of packages that he or she has contributed to, and the count. The data and page here are generated via this repository in the contributors directory. If you want to see the flip of this graph - the packages with counts of developers - see here.
Mouse over a contributor circle to see contributions.