The best replacement for artifactory is nexus.

The best alternatives to artifactory are rated as following:
★★★★★  nexus
★★★★  archiva
★  sonatype
★  sonatype nexus

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Speaking about artifactory, one probably shouldn't forget about gradle.

Other search terms related to artifactory and their ratings are:
★★★★★ gradle
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artifactory
nexus
archiva