OpenSC / OpenSC

Open source smart card tools and middleware. PKCS#11/MiniDriver

ghostunnel / ghostunnel

A simple TLS proxy with mutual authentication for securing non-TLS services.

sgomez / rfirma

Reimplementación nativa y ligera de AutoFirma en Rust (Tauri) y React, sin dependencia de JRE.

MatthiasValvekens / pyHanko

pyHanko: sign and stamp PDF files

digitalbazaar / forge

A native implementation of TLS in Javascript and tools to write crypto-based and network-heavy webapps

square / certigo

A utility to examine and validate certificates in a variety of formats

xipki / xipki

XiPKI: Compact open source PKI (CA, OCSP responder, certificate protocols ACME, CMP, EST, SCEP), with full support of PQC MLDSA (Dilithium) and MLKEM (Kyber).

NoMoreFood / putty-cac

Windows SSH client with smart card, certificate, and FIDO authentication, including YubiKey and passkey support, plus tabbed terminal sessions.