If you have a found a model but it isn't in the format you can use, there is a tool recently released called CIMHub that has been released that can convert models to/from several different popular formats including:

Cyme

OpenDSS

GridLabD

CIM

Synergi

The repository for the latest version of the tool is here:

https://github.com/GRIDAPPSD/CIMHub/tree/develop

The project is active with updates being made relatively frequently.

Would love to hear from anyone who has been using it or attempted to use it.