Ecosyste.ms: Packages
An open API service providing package, version and dependency metadata of many open source software ecosystems and registries.
repo1.maven.org "systems" keyword
net.librec:librec-core 2.0.0
LibRec is A Java Library for Recommender Systems1 version - Latest release: about 7 years ago - 13 dependent repositories - 3,153 stars on GitHub