Nexus Repository OSS is distributed with Sencha Ext JS pursuant to a FLOSS Exception agreed upon between Sonatype, Inc. and Sencha Inc. Sencha Ext JS is licensed under GPL v3 and cannot be redistributed as part of a closed source work.
Nexus Repository Manager 2 OSS is a repository manager which can be freely used and is distributed under the Eclipse Public License (EPL Version 1).