MLeap is a serialization format and execution engine for machine learning pipelines. You can find the package at the MLeap GitHub repo. It is an open source package and employs the Apache License 2.0.
Databricks on Google Cloud does not support open source MLeap. To use MLeap, you must create a cluster running Databricks Runtime for Machine Learning, which has a custom version of MLeap preinstalled.
The following notebook gives an example of a model export workflow.