METACRAN is a (somewhat integrated) collection of small services around the CRAN repository of R packages. It contains this website, a mirror at GitHub, a database with API, package search, database of package downloads (from the RStudio mirror), tools to check R packages on GitHub, etc.
See the menu on top for the complete list.
METACRAN is not a CRAN project. No METACRAN services use any of the CRAN mirrors or other CRAN infrastructure, other than downloading new and updated packages and other files.
METACRAN is not a separate R package repository. It contains exactly the same packages as CRAN itself.
Yes, please! METACRAN is developed completely in the open. All code and files are on Github at https://github.com/metacran .
Found an error on this web site? Really sorry about it. Please report it in the issue tracker. Pull requests are also more than welcome.
Are all welcome! Send pull requests or just open issues please.