EPPlus

Announcement: new license model from version 5

EPPlus has from this new major version changed license from LGPL to Polyform Noncommercial 1.0.0.

With the new license EPPlus is still free to use in some cases, but will require a commercial license to be used in a commercial business.

This is explained in more detail here.

Commercial licenses, which includes support, can be purchased at (https://www.epplussoftware.com/).

The source code of EPPlus has moved to a new github repository