Packages 
Package Description
org.eclipse.aether.impl
The provisional interfaces defining the various subcomponents that implement the repository system.
org.eclipse.aether.impl.guice
The integration with the dependency injection framework Google Guice.
org.eclipse.aether.internal.impl
The various sub components that collectively implement the repository system.
org.eclipse.aether.internal.impl.checksum  
org.eclipse.aether.internal.impl.collect
Internal helper classes for dependency collector.
org.eclipse.aether.internal.impl.collect.bf  
org.eclipse.aether.internal.impl.collect.df  
org.eclipse.aether.internal.impl.filter  
org.eclipse.aether.internal.impl.resolution  
org.eclipse.aether.internal.impl.slf4j  
org.eclipse.aether.internal.impl.synccontext  
org.eclipse.aether.internal.impl.synccontext.legacy  
org.eclipse.aether.internal.impl.synccontext.named  
org.eclipse.aether.internal.impl.synccontext.named.providers
As end-user "mappers" are actually configurations, constructed from several NameMapper implementations, this package have providers exposing name mappers constructed by NameMappers helper class.