pkcs11 topic
xca
X Certificate and Key management
ghostunnel
A simple SSL/TLS proxy with mutual authentication for securing non-TLS services.
putty-cac
Windows Secure Shell Client With Support For Smart Cards, Certificates, & FIDO Keys
xipki
XiPKI: Compact open source PKI (CA, OCSP responder, certificate protocols ACME, CMP, EST, SCEP) with HSM support.
endesive
en-crypt, de-crypt, si-gn, ve-rify - smime, pdf, xades and plain files in pure python
python-pkcs11
PKCS#11/Cryptoki support for Python
tpm2-pkcs11
A PKCS#11 interface for TPM2 hardware
OpenSC
Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend
Pkcs11Interop
Managed .NET wrapper for unmanaged PKCS#11 libraries
yubico-piv-tool
Command line tool for the YubiKey PIV application