I found out there is no OLEDB or native ADO.NET driver for OpenEdge.
Has anyone had success in using the OpenEdge driver with Linq or Entity Framework?
There is still no official solution from ProgressSw but I can recommend the provider from Alex Wiese (see Answer below): EntityFrameworkCore.OpenEdge
Because ODBC is the only supported Interface for .net Clients you can't use OpenEdge DB with Entity Framework directly (Why doesn't Entity Framework support ODBC?).
But there is a commercial ADO.NET Driver for OpenEdge from OpenLink and an unofficial NHibernate Dialect.