GNOME Keysign is a tool to make signing OpenPGP keys as easy as possible.
This is the v0.9.7.1 release which fixes only the appdata.
You can get the app from:
https://github.com/GNOME-Keysign/gnome-keysign/
Changes
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* Generate appdata with XML declaration
Resources
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Download: https://github.com/GNOME-Keysign/gnome-keysign/archive/0.9.7.1.tar.gz
Web site: https://wiki.gnome.org/Apps/GnomeKeysign