Enigmail

PyGPGME   (Compare Project)

License: lgpl21_or_later

GnuPG   (Compare Project)

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License: gpl

OpenPGP.rb   (Compare Project)

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License: mit

GPGPreferences   (Compare Project)

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License: gpl3_or_later

Ruby-GPGME   (Compare Project)

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License: lgpl

pgp-keyserver   (Compare Project)

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Gpg4win   (Compare Project)

Mostly written in shell script

License: gpl

MacGPG2   (Compare Project)

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License: Unknown

Distributed Privacy Guard   (Compare Project)

Mostly written in C++

License: GPL2

OpenSC   (Compare Project)

Mostly written in C

License: lgpl