The Universal Directories app can be used in any Jira reduction: Core, Software, Service Management.
Jira Service Management
The app allows using the Directories Select field on Service Desk Management as a usual select list.
HelpDesk for Jira
The app is compatible with HelpDesk for Jira plugin: you can allow your customers to select, browse and manage the Directories entries the same way as in Jira.
The app's Directories Select custom field is available as a filter in the Agile Filters app.