
Description: Free Combine PDF 4dots is a free, lightweight PDF tool that allows you to combine multiple PDF files into one document. It has a simple drag-and-drop interface for combining files quickly.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: PDFill is a free PDF editing software that allows users to fill out, edit, merge, split, rearrange, encrypt, decrypt, print and save PDF documents. It has basic PDF functionality for free.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API