OpenEMPI is an open source implementation of an Enterprise Master Patient (EMPI) which is a repository that maintains a registry of all patients across an enterprise.
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The Gazelle project is aimed at developing testing tools for IHE. This tools shall test the interoperability of medical systems and the compliance of the messages send bu those systems with standards recommended by IHE.
Gazelle is replacing Kudu, the tool that was first designed to manage IHE connectathon.