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For the producer we use the NERDS projects (https://github.com/fredrikt/nerds) JSON format to save the data. How to actually collect data depends on what you want to collect data from.
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The only NORDUnet consumer today is NOCLook (http://git.nordu.net/?p=norduni.git) which is a web gui made with the Django web framework and Neo4j graph database as backend for the inventory data model. The data is added to the Neo4j database via the REST interface using norduni_client.py which builds on neo4j-rest-client.
Repository
GIT is used to handle the revisions of the collected data.
Links
https://ni.nordu.net http://nidev-consumer.nordu.net (bleeding edge)