Put simply, is there any way to find out how widely used a given open source project is?
Say, for example, I am looking for a serialization library. I can imagine various metrics to help choose among the many available, but a major one would be, "How widely used is this?"
Wide adoption tends to suggest either a very mature project, or one with a very active community.
For Python, PyPI at least provides download statistics. On GitHub you can see the number of forks as a guideline.
For a developer embarking on a new project, and wanting to leverage an OSP, this type of information is very valuable in making their choice.
The open source movement is not just about publishers, but consumers as well.