
Description: Lightweight PDF is a free, open source PDF viewer for Windows. It is a fast, small, and feature-rich PDF reader. It allows viewing, printing, and searching PDF documents.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Sejda is an open source PDF desktop software for Windows, Mac and Linux that allows users to manipulate PDF files. It offers features like merging PDFs, splitting PDFs, compressing PDFs, adding headers/footers, reordering pages, encrypting/decrypting files, adding watermarks and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API