A free, open-source, robust yet user-friendly, compact and cross-platform tool for OpenPGP encryption. It stands out as an exceptional GUI frontend for the modern GnuPG (gpg).

Foxit PDF Editor is a robust and feature-rich alternative to Adobe Acrobat, designed for creating, editing, organizing, and securing PDF documents with ease.

inserting an image of your handwritten signature. You can also use a digital identity to sign a form. You may decide to use this option if you’ve created a digital identity before to sign other PDF ...

PDF functions include creation and modification, assembly, conversion to images and HTML, automated printing, encryption and digital signatures, form fields, viewing and markup, optimization ...