Sioyek is a PDF viewer with minimal interface optimized for reading research papers and technical books.




PrivatePDF is described as 'Free web tool that lets you make quick PDF edits from within your web browser, without uploading anything anywhere' and is a PDF Editor in the office & productivity category. There are more than 25 alternatives to PrivatePDF for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best PrivatePDF alternative is SumatraPDF, which is both free and Open Source. Other great apps like PrivatePDF are Okular, Foxit PDF Reader, Evince and PDF-XChange Editor.
Sioyek is a PDF viewer with minimal interface optimized for reading research papers and technical books.




Xournal is an application for notetaking, sketching, keeping a journal using a stylus. It is free software (GNU GPL) and runs on Linux (recent distributions), Windows and other GTK+/Gnome platforms.

Create, Convert, Review and Edit PDF Documents on Windows, macOS, and Linux.




Xodo is the ultimate cross-platform PDF viewer and annotator. Powerful, fast, and optimized for all phones and tablets, Xodo makes it easy to access, edit, share, sync, manage, sign, and more.




Read, annotate, and highlight PDFs, fill interactive forms with saved input, underline or strike through text, manage bookmarks, sync files from cloud services, and share documents. Compatible with Preview and Adobe Acrobat annotations, supporting extensive iOS features.




Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .


doPDF allows you to freely convert documents to PDF files. It installs as a printer driver, enabling you to print from any Windows application.




Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.




Comprehensive solution for editing, signing, form filling, OCR scanning, commenting, converting, and redacting PDFs, with AI-driven analysis and content extraction, data export to spreadsheets, text-to-speech, seamless use across desktop and mobile, and batch processing.




PDF viewer for macOS supports scientific papers, annotations, highlights, bookmarks, split view, exporting notes, AppleScript, multiple annotation types, bibliography integration, full-screen, search, and compatibility with various macOS versions.

The top AEC PDF app to markup and manage drawings and documents. Ideal for replacing pen and paper, avoid printing documents again by using our intuitive feature set that makes marking up a PDF easy. Open or create a new PDF, markup using our extensive array of tools, then save...




Atril is a simple multi-page document viewer. It can display and print PostScript (PS), Encapsulated PostScript (EPS), DJVU, DVI, XPS and Portable Document Format (PDF) files. When supported by the document, it also allows searching for text, copying text to the clipboard...