PDF++: The most Obsidian-native PDF annotation, viewing & editing tool ever. Comes with optional Vim keybindings.

Annotation layer for pdf.js

An annotation extension based on the PDF.js viewer. Supporting the editing of existing PDF file annotations, posting comments, replying, submitting annotation data, and loading for further editing.

Modular multi-screen pdf presentation viewer

Alfred Workflow to extract annotations from PDF files.

C# and VB.NET samples for Docotic.Pdf library

Simple "digitial paper" for note taking and PDF annotation. Heavily inspired by Xournal.

A React component for annotating PDF, powered by PDF.js and RecogitoJS

Full-featured PDF viewer with enhancements especially for academic papers

Search comments and highlights annotations in PDF documents.

There is already a gist available, just making it somewhat easy to use as Docker container or vagrant config, so it could be useful to others

Knowtate is a sophisticated platform designed to elevate your academic research experience. Seamlessly blend reading, note-taking with markdown, and knowledge management into one intuitive interface, allowing you to effortlessly track your insights and ideas as you delve into scholarly literature.

Theses-Checker is a tool for students and teachers alike to check theses for frequent typographical errors. (This program is a part of a bachelor's thesis.)

PDF format annotation and labeling support for Label Studio

Fork of Moodle/editpdf, with custom options

Flare is a LaTeX package and an extension to \includegraphics copying PDF annotations.

A software for extracting pdf annotations.

Tiny tool help creating PDF links in Adobe Illustrator.

Display PDFs with a pointer, make quick annotations (that automatically disappear), and zoom them