XOS is a framework for operationalizing a collection of disaggregated services. It is packaged as a project in the Open CORD initiative, with source code managed through https://gerrit.opencord.org. It is also mirrored at https://github.com/opencord.
You can download and use XOS either as part of CORD (see the CORD Guide for details) or as a standalone component (see the XOS Guide for details). Also visit the XOS Wiki Page for additional information.