GnuPG Made Easy (GPGME) is a library designed to make access to GnuPG
easier for applications. It provides a high-level Crypto API for
encryption, decryption, signing, signature verification, and key
management. Currently it uses GnuPG as its back-end, but the API is not
restricted to this engine.

Because the direct use of GnuPG from an application can be a
complicated programming task, it is suggested that all software should
try to use GPGME instead. This way bug fixes or improvements can be
done at a central place and every application benefits from this.
Authors of MUAs should especially consider using GPGME. Creating a set
of standard widgets for common key selection tasks is even planned.