Open Source PDF viewer Projects

Local-first, end-to-end encrypted alternative to Notion that lets you build a private knowledge base, docs, and tasks with no central server.

Open source Notion alternative that brings projects, wikis, and teams together with AI while keeping you in control of your data.

Open source, local-first Slack and Notion alternative that puts you in control of your data with offline support and end-to-end encryption.

A PDF viewer that seamlessly integrates with any JavaScript project

KillerPDF is a lightweight, fully portable PDF editor for Windows. Edit, merge, annotate, and sign PDFs locally with no subscription, accounts, or hidden telemetry anywhere on your computer.

Cross-platform ebook reader supporting PDF, EPUB, MOBI, comics and more, with sync across Windows, macOS, Linux, Android, iOS, and Web.

Privacy-first, open source knowledge management and note-taking platform that is a powerful Roam Research and Obsidian alternative.

Self-hosted PDF manager, viewer, and editor with multi-device sync, tagging, and an in-browser reader; deployable via Docker.

Lightweight GTK PDF presenter for dual-screen setups, showing current slide, next slide, and presenter notes on separate displays.

Cross-platform PDF viewer focused on textbooks and research papers with smart navigation, marks, bookmarks, and bibliography jumping.

End-to-end encrypted, open source notes app that is a privacy-focused alternative to Evernote, Notion, and Apple Notes.

Lightweight, free PDF, eBook, and comic reader for Windows that launches instantly and stays out of the way; multi-format support with minimal interface.