GNOME Keysign is a tool to make signing OpenPGP keys as easy as possible.
This is the v1.1 release which introduces key transport via the Internet.
You can get the app from:
https://github.com/GNOME-Keysign/gnome-keysign/
Changes
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* Allow to drag and drop an email or its attachment into the app
* show options to save produced certification as a file
* Added a tooltip to the Internet button
* Change logo to a wax seal
* select usable private keys for signing, only
Resources
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Download: https://github.com/GNOME-Keysign/gnome-keysign/archive/1.1.tar.gz
Web site: https://wiki.gnome.org/Apps/Keysign