TODO (Feel Free to add information, please indicate if it is Free Software or not and if it uses the recommended ~GPGME and uiserver ~APIs of ~GnuPG)
=== duplicity

//Duplicity backs directories by producing encrypted tar-format volumes and uploading them to a remote or local file server.//
[..] //uses GnuPG to encrypt and/or sign these archives//

License GNU GPL v>=2.

API: uses its own embedded gpginterface.py, process based, **does not use ~G~PGME**