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 GPGME