FMI Library (FMIL) is a software package available from JModelica.org, written in C that enables integration of Functional Mock-up Units (FMUs) import in applications. FMI Library is an independent open-source implementation of the FMI open standard that is developed and maintained under JModelica.org by Modelon.

FMI Library is the basis of the official FMI Compliance Checker  provided by the Modelica Association.