# History and Downloads ## BSeR FHIR Implementation Guide The BSeR FHIR Implementation Guide was developed using Simplifier, a FHIR IG authoring tool from Firely. The simplifier export is maintained in [github](https://github.com/HL7/bser) and is part of the FHIR continous build process. ## BSeR FHIR IG History See the {{pagelink: history }} page for information about prior versions of this specification.