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)
gpg4usb
http://www.gpg4usb.org seems to use GnuPG 1.4.x and Qt. Version 0.3.3 may still use GPGME. The TODO file aims for the use of its own kgpg connection.
portable-application, which combines a simple text-editor with a GnuPG-frontend to write, encrypt and decrypt your text-messages and files.
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