Software Galaxies visualizes dependencies among most popular package managers. Every star in this visualization represents a package.
What do I see here?
Every dot here is a package. Position of a package is determined by force based graph layout algorithm and usually clusters together packages that depend on each other.
Some packages are connected by lines. It means one package depend on another. Image above shows only very close connections. We can also see all connections, but the image becomes obscure by amount of connections.
The size of the dots represents total number of dependents. The bigger the star - the more packages are using it.