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Maven is currently archived by Software Heritage:

Developed by Castalia Solutions thanks to a grant from the Alfred P. Sloan Foundation

Maven is Java’s main package manager. There are multiple Maven repositories, each of which store both binary packages (JAR files containing Java classes) and source code (as source JARs). Software Heritage archives the latter.

Additionally, Software Heritage archives each package’s pom.xml as extrinsic metadata and mines them for links to external version control systems to archive.

See the Maven lister’s documentation for details on its implementation.