JMAP offers a standardized way to access data in email and groupware accounts covering email messages, address books, calendars, tasks and even more.

OpenXPort JMAP is a PHP library which can be used to, e.g., lift data from legacy systems (e.g., vCards on a server) for portability and migration or to add JMAP functionality to existing systems. E.g., OpenXPort JMAP is used in extensions that provide JMAP address book and calendar APIs to Roundcube Webmail and Nextcloud.