Scripts and data behind Package Name Prefixes.

Pulls every package name from PyPI, npm, crates.io, rubygems, hex, hackage and NuGet via the ecosyste.ms packages API, splits on -/_/., and counts first-token prefixes.

Name lists and cluster files from 21 July 2026 are committed as .gz under data/. Decompress before running the analysis scripts:

gunzip -k data/*.gz

To fetch fresh:

ruby fetch_names.rb          # pypi, crates, rubygems, hex, hackage
ruby fetch_names_windowed.rb # npm, nuget (paged into data/parts/)
ruby cluster.rb              # produces data/*.clusters.json

FINDINGS.md has the working notes, CLOUD_VENDORS.md the per-vendor SDK breakdown.

The source code and documentation are licensed under the MIT License.

The files under data/, along with cluster_full.txt, owners_400.txt, owners_400_rest.txt, and growth_chart.html, are licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.