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

== Enigmail

https://www.enigmail.net

//a data encryption and decryption extension for Mozilla Thunderbird and the SeaMonkey internet suite that provides OpenPGP public key e-mail encryption and signing. //

License: MPL 2, GNU GPL 2+

API: **no ~G~PGME**, **no UIServer**

=== gpg4usb

http://www.gpg4usb.org seems to use ~GnuPG 1.4.x and Qt. 

//portable-application, which combines a simple text-editor with a GnuPG-frontend to write, encrypt and decrypt your text-messages and files.//

API: Version 0.3.3 may still use ~G~P~GME. The TODO file aims for the use of its own kgpg connection. **no UIServer**

=== 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**