XyphroLabs's UsbGpib is an open-source hardware, inexpensive, and portable USB to GPIB adapter aiming to provide "access to ...
ioBroker needs special permissions to control GPIOs. On most Linux distributions this can be achieved by adding the ioBroker user to the gpio group.
Swoosh comes with many adapters, including SendGrid, Mandrill, Mailgun, Postmark and SMTP. See the full list of adapters below. The complete documentation for Swoosh is available online at HexDocs.