There are many support options for Evergreen, both free community based and vendor assisted. Being open-source, the support & development options available are not limited to what is provided by a single vendor. This is probably an important part of the open-source model - there is no vendor lock-in. Institutions may choose to support the product in-house, obtain help from a support company, and/or solicit help from their peers in the Evergreen community.
Paid Support - Several companies provide support & development services for Evergreen. Services that are available for libraries include installation, migration assistance, data integrity testing, staff training, software maintenance, and development of new features.