OpenSC provides a set of libraries and utilities to access smart cards.
Its main focus is on cards that support cryptographic operations, and
facilitate their use in security applications such as mail encryption,
authentication, and digital signature. OpenSC implements the PKCS#11 API
so applications supporting this API such as Mozilla Firefox and
Thunderbird can use it. OpenSC implements the PKCS#15 standard and aims
to be compatible with every software that does so, too.
From Douglas Santos <dsantos@hydroxyl.org>