Want to create your own CA? Have a pain typing openssl command? With Certificate Utilities, we include many functions like create private key. This is the most professional and free certificate toolkit based on openssl and lisenced under under GPL!
Crypto.Net is a free and open cryptography library for C# and .Net. AES (Rijndeal), Twofish, Blowfish, RSA, Diffie-Hellman, SSL/TLS, X509-Certificate builder, stream cipher modes or a secure netowrk stream are only some features of this library.