Network Security Services (NSS) is a set of libraries designed to support
cross-platform development of security-enabled client and server applications.
Applications built with NSS can support SSL v3, TLS, PKCS #5, PKCS #7,
PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security
standards.

Homepage:
https://firefox-source-docs.mozilla.org/security/nss/
