With Xounral++ you can add and use layers to make complex notes that are still pleasant to work with. Support for pressure-sensitive stylus and drawing tablets (Wacom, Huion, XP-Pen, etc.) Robust and customizable pen, highlighter and eraser tools, allowing you to write how you want to write. A modern rewrite and a more feature-rich version of the wonderful Xournal program. Xournal++ (/ˌzɚnl̟ˌplʌsˈplʌs/) is an open-source and cross-platform note-taking software that is fast, flexible, and functional.

The app is responsive for mobile and tablet screens. You can also adjust line height, font size, font family, and add text annotation easily. It allows you to add images, signatures, and text to any PDF file directly within your browser. Offline PDF editor is a simple web-based PDF editor that works completely offline. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a PDF editor. PDFedit is a free open source PDF editor and a library for manipulating PDF documents, released under terms of GNU GPL version 2. When using a numerical grading system, the tool computes the total and sub-totals, and exports the grades of a whole set of corrected documents as a. PDF4Teachers includes special functionalities for annotation of grades and offers a tool for grading scale (marking scheme). Designed for teachers, this app keeps recorded previous annotations, and offers features like marking scale, PDF conversion, and many more.

PDF4Teachers is a free open-source PDF editing software in large quantities. The project is hosted on GitHub and uses license LGPLv3. For users, there are four applications offering many features. For developers, there is a C++ library and a command line tool for use in scripts. It is a modern solution for viewing/editing/rendering PDF documents, for users and developers alike. PDF4QT is an open source PDF editor for Windows/Linux. Most of them are cross-platform apps, and comes ready to use without difficult setup or complex configuration. Here, we present to you the best PDF editor apps that are free and open-source.

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