
Description: PDF-XChange Editor is a PDF editor and viewer software for Windows. It allows users to view, edit, annotate, OCR and sign PDF documents. Key features include editing text and images, adding comments, signing documents electronically, and converting PDFs to other formats.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Combine PDF is a free online tool that allows you to merge multiple PDF files into one single document. It provides an intuitive interface to add and organize files, apply page numbers or delete pages, and download or print the combined PDF.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API