NGINX
NGINX is an open-source software for web serving, reverse proxying, caching, load balancing, media streaming, and more. It started out as a web server designed for maximum performance and stability. In addition to its HTTP server capabilities, NGINX can also function as a proxy server for email (IMAP, POP3, and SMTP) and a reverse proxy and load balancer for HTTP, TCP, and UDP servers.
Libp11 provides an engine_pkcs11 that tries to fit the PKCS#11 API within the engine API of OpenSSL. That is, it provides a gateway between PKCS#11 modules and the OpenSSL engine API.
Utimaco CryptoServer HSM
CryptoServer is a hardware security module developed by Utimaco IS GmbH. CryptoServer is a physically protected specialized computer unit designed to perform sensitive cryptographic tasks and to securely manage, as well as store, cryptographic keys and data. It can be used as a universal, independent security component for heterogeneous computer systems.