The best open source alternative to PDF Signer is LibreOffice - Writer. If that doesn't suit you, our users have ranked more than 25 alternatives to PDF Signer and seven of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to PDF Signer are PDFedit, LibreSign, JSignPdf and FormulatePro.
An open-source word processor offering rich formatting and style options across multiple platforms. Versatile enough to handle both simple memos and complex book publishing, it supports a wide range of document formats and Microsoft Word compatibility, enhancing productivity through templates and layouts.
Free (and open source) editor for manipulating PDF documents. GUI version + commandline interface. Scripting is used to a great extent in editor and almost anything can be scripted, it is possible to create own scripts or plugins.
LibreSign is a web application for electronic signatures (e-Sign) that offer the possibility of signing documents online with security and agility.
JSignPdf is a Java application which adds digital signatures to PDF documents. It can be used as a standalone application or as an Add-On in OpenOffice.org. The application uses the jsignpdf-itxt library for PDF manipulations (based on iText library in version 2.1.
FormulatePro helps you open and write on PDF documents. You can fill out any PDF form document, drop in graphics, scribble with the mouse or a tablet, save and print.
PortableSigner is a signing (with X.509 certificates) program for PDF files. It's platform independent and runs (tested) under Windows (2000, XP, ...), Linux, and macOS.
OpenSignature is an open source project for the digital signature of documents. It works with all cards supported by OpenSC and focuses on adding support for cards from accredited Italian CAs.
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