Scute is currently the only implementation of PKCS #11 for the OpenPGP smart card. Apart from that, it offers a couple of other benefits:
Anybody can use, modify, and redistribute it under the terms of the GNU General Public License (see Copying).
Although Scute initially provided a single function, client authentication using OpenPGP smart cards in Mozilla-based web browsers, it was built with the intention of supporting other applications as well in the future.
Building and installing Scute is easy, and preparing smart cards for use with Scute is a snatch using the GnuPG 2.0 framework. The integration of Scute into the application is seamless.