X Certificate and Key management is an interface for managing asymetric keys like RSA or DSA. It is intended as a small CA for creation and signing certificates. It uses the OpenSSL library for the cryptographic operations.
Please see the XCA homepage http://hohnstaedt.de/xca
inKey - small encryption utility with big encryption block (> 800 000 bit).
This program can protect very sensitive data, such e-mail, which has size up to 100 kilobytes, but processing speed might be too small with the bigger size of source data.
ProcessingTime(data) = O(data ^ 2);
USE IT ONLY TO PROTECT SMALL FILES (~ 100 Kb or a bit bigger).
mod_gnutls uses the GnuTLS library to provide SSL 3.0, TLS 1.0, TLS 1.1 and 1.2 encryption for Apache HTTPD. It is similar to mod_ssl in purpose, but does not use OpenSSL.
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Adytum is a certificate authority suite, powered by OpenSSL, specifically designed for internal use small enterprises which need a secure and robust PHP solution without the rich feature set of software aimed at large retail CAs.