Update:
The Nexus Migration Plugin is no longer supported. Migration information can be found in the Sonatype Nexus Repository documentation.
For context, the original blog post text appears below.
Sonatype is pleased to announce version 1.5 of the Nexus Migration Plugin. This version contains an updated implementation of our Artifactory to Nexus migration tool. If you are currently running Artifactory and you want to migrate to Nexus, all you need to do is:Create a System Export from Artifactory.
Install Nexus with the Nexus Migration Plugin.
Import Your Artifactory System Export to Nexus.
Configure the Artifactory Bridge to seamlessly serve artifacts to existing clients.
To get started, download Sonatype Nexus Repository or Sonatype Nexus Repository OSS, then download the Nexus Migration Plugin.