Free and open-source PDF signing and verification application.
Twinkle is an open-source text editor.
A free and easy-to-use password protected file archiver
Java password management tool
Digital Signature for PDF documents in Spanish
FIDO strong authentication, encryption, digital signature engine
JCryptor is an encrypting tool based on the Caesar-cipher.
Java code that enables you to sign documents using a smart card.
Software para assinar arquivos no formato PKCS7