There are so many libraries, for instance for C# networking or Java encryption.
I am looking for data about the "popularity" of published libraries.
Any measure of "popularity" is fine, for instance it could be defined as:
Bonus if the data is easily searchable using a web browser.
Github is the de facto internet repository for open source code. They've released source code data from packages hosted on this site (press release, blog post with examples).
The data is available as part of Google BigQuery (details). Example queries are here. You can run queries in the browser (requires google account)
This 3TB+ dataset comprises the largest released source of GitHub activity to date. It contains a full snapshot of the content of more than 2.8 million open source GitHub repositories including more than 145 million unique commits, over 2 billion different file paths, and the contents of the latest revision for 163 million files, all of which are searchable with regular expressions.
To compare languages, you can count and group by extension name, for example
AND sample_path LIKE '%.py' -- for python
Tip:
Don’t analyze the main [bigquery-public-data:github_repos.contents] table — at 1.5 TB, it will instantly consume your monthly free terabyte. Use instead the official [bigquery-public-data:github_repos.sample_contents] extract (~23 GB), or one of the full language tables I left at [fh-bigquery:github_extracts.contents_*].
https://mvnrepository.com lets you know how many times a particular Java library has been downloaded, with a breakdown for each version, see the "Usages" column for Log4j:
... and for its competitor LogBack:
Obviously, you have to divide the number of downloads by the duration the library has been available (date column) and consider that people continue downloading old libraries, especially when they are more stable.
Caveats:
