Etherpad: A modern really-real-time collaborative document editor.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
MIT Deep Learning Book in PDF format (complete and parts) by Ian Goodfellow, Yoshua Bengio and Aaron Courville
Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source
OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched
Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
Universal File Online Preview Project based on Spring-Boot
PDF补丁丁——PDF工具箱，可以编辑书签、剪裁旋转页面、解除限制、提取或合并文档，探查文档结构，提取图片、转成图片等等
Display PDFs in your React app as easily as if they were images.
Web page PDF/PNG rendering done right. Self-hosted service for rendering receipts, invoices, or any content.
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