
Description: PDF Expert is a PDF reader and annotation tool for Mac. It allows you to view, edit, annotate, sign, and fill PDF documents. Key features include tabbed browsing, annotation tools, OCR text search, encryption support, digital signatures, and form filling.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Xournal++ is a free, open-source notetaking and sketching software for Linux. It supports pen input and annotations on PDFs. Key features include sticky notes, rulers, page templates, shape recognition, and LaTeX support.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API