perfSONAR is 100% open source. Information on licensing can be found here.
See the installation options section of the user manual to determine which perfSONAR installation option is right for you.
Release notes can be found here.
A comprehensive installation and user guide is available for perfSONAR at https://docs.perfsonar.net.
Source code can be found in the project’s GitHub repository at https://github.com/perfsonar.