OpenSC Alternatives
OpenSC is described as 'provides a set of libraries and utilities to work with smart cards. Mainly on cards that support cryptographic operations, and facilitate their use in security applications such as authentication, mail encryption and digital signatures' and is an app. There are four alternatives to OpenSC for Windows, Linux and Mac. The best alternative is YubiKey PIV Manager, which is both free and Open Source. Other great apps like OpenSC are Pkcs11Admin, Cardpeek and PUPPICAD.
The YubiKey PIV Manager enables you to configure a PIV-enabled YubiKey through a graphical user interface.
Pkcs11Admin is an open-source GUI tool for administration of PKCS#11 enabled devices (smartcards, HSMs etc.) which runs under .NET 4.5 on MS Windows and under Mono 3.X on Linux and Mac OS X.
PUPPICAD is a free Computational Design and Engineering Development Environment.