OpenSC

OpenSC provides a collection of libraries and command‑line tools for interacting with smart cards and related security tokens. It supports a range of card types, including CAC, PIV, OpenPGP, and various vendor‑specific applets, and offers configuration files and manual pages to control its behavior. The project supplies pre‑built installers for Windows (both Intel and ARM architectures) and macOS, as well as source tarballs for custom builds on Unix‑like systems.

The software is aimed at developers and system administrators who need to integrate smart‑card authentication, signing, or encryption into applications or infrastructure. Documentation on the OpenSC Wiki includes quick‑start guides for Windows and macOS, compilation instructions for Unix flavors, and a FAQ section, while automated builds and testing pipelines monitor compatibility across multiple platforms and card applets.

OpenSC is maintained as a stable release with continuous integration checks for Linux, Windows, and macOS, and it provides nightly source snapshots for users who wish to test the latest development code.