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
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