Open Source IMDF file creators / editors

Are there any solutions to convert floor plans to IMDF files for Indoor Mapping (or at least plans to create a conversion tool)?

Most of the tools such as ERSI and Autodesk seem to be developed more for building engineers and architects. Is there anything for content managers to ingest floor plans (provided by our facilities dept), and create and update locations in buildings as they change, and publish to an in-app Apple map implementation?

Thanks in advance,

Scott