PKI.js is a pure JavaScript library implementing the formats that are used in PKI applications (signing, encryption, certificate requests, OCSP and TSP requests/responses). It is built on WebCrypto (Web Cryptography API) and requires no plug-ins.

EJBCA® – Open-source public key infrastructure (PKI) and certificate authority (CA) software.

Heimdal

opinionated TLS client & server PKI management tool

PKI Testsuite to test products of the telematic infrastructure to fulfill the gemSpec_PKI specification. This test suite is used for approval tests of different products like VSDM Fachdienst, KIM Fachdienst, VPN Zugangsdienst, Intermediär, etc.

The Utility to view CV Certificate.Card Verifiable Certificates (CVC) are digital certificates that are designed to be processed by devices like smart cards, E-passport and etc.

PKI Engineering Repository for Secure Web Application Development

Pki with openSSL

A Poorly Written PoC demonstrating how Messenger Apps can change User IDs while still being able to communicate seamlessly with others

Graphical Crypto Toolkit