
Description: PDF4Free is a free, open-source PDF editor that allows users to view, create, edit, convert, encrypt, sign and print PDF documents. It offers basic PDF editing features like adding text, images, shapes, whiteout, highlights, annotations and digital signatures.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: PDF24 Creator is a free PDF printer for Windows that allows you to easily create PDF files from any program. It installs as a virtual printer and works by printing from other apps to generate PDFs.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API