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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