Maven: a build automation tool maintained by Apache
Maven repository: a host for maven artifacts
Maven Central: the biggest host, maintained by Sonatype
JFrog: a company
Bintray: JFrog’s maven repository
Artifactory: JFrog’s repository manager that anyone can self-host
Jcenter: JFrog’s public instance of Artifactory that syncs to Maven Central
Sonatype: a company
Sonatype Nexus: Sonatype’s repository manager that anyone can self-host
Sonatype OSSRH: Sonatype’s public instance of Nexus that syncs to maven central
FYI: there are other semi-real-time mirrors of maven central, such as one hosted on Google Cloud Platform
It's Sonatype OSSRH. 😉