Hibernate's core ORM functionality

Kronikol4J core — the stable tracking seam (data model, logger, context, correlation, registry, constants). Zero runtime dependencies beyond the JDK.

Bacting Core

Spring Core (community-maintained fork based on Spring Framework 5.3.39 with selected security backports; not an official Spring release)

Core JSON:API engine: resource registry, dispatcher, module system, QuerySpec. Framework-agnostic.

Katalyst module: katalyst-core

JAORM (Core)

Togglz - Core Framework

Core abstractions and API

LLM Agent Runtime Core