calibre Alternatives

Okular

Okular is a universal document viewer based developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, *BSD, etc. Okular combines the excellent functionalities with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, XPS, ePub and others. Okular is a Free Software PDF reader.

Features:

• PDF annotation
• Lightweight
• Low memory usage
• Export to PDF
• Tabbed interface
• Text to Speech
• Chapter cursor
• Document reader
• Fill PDF Forms
• Text Highlighting
• Trim margins

Cool Reader

Cool Reader is fast and small cross-platform XML/CSS based eBook reader for desktops and handheld devices. Understands a number of text document formats, suppurt OPDS (in new ui-opengl version). Fully customizable palette, text reformatting with any font size, font antialiasing, extra smooth scrolling and a lot of other features turn reading into a pleasure. Read Aloud function saves your eyes.

Features:

• Interface Overlay
• Library Manager
• Portable

Polar

Polar is a powerful desktop app for managing all your web content, books, and notes. Polar keeps all your content in one place, supports tagging, annotation, highlighting and keeps track of your reading progress. POLAR allows you to keep all your documents, annotations, and flashcards in once place. Never lose track of what you're reading again.

Features:

• PDF annotation
• Offline Reading
• Capture web pages
• Google Chrome Extensions
• Cloud sync
• Document annotations
• Document Repository
• Learn with Flashcards
• Export to PDF
• Save web page for offline use
• Sync with Anki
• Tags
• Technical paper notes
• Text Highlighting
• Web-Based
• Website annotation

Data Crow

Data Crow is the ultimate media cataloger and media organiser. Always wanted to manage all your collections in one product? You want a product you can customize to your needs? Your search ends here! Using Data Crow allows you to create a huge database containing all your collected items. You can use the excellent online services to retrieve the information instead of typing all the information yourself.

Features:

• Library
• Categories
• CD Database

Document Viewer

Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid . Supports the following formats: - PDF - DjVu - EPUB - XPS (OpenXPS) - CBZ (Comic Books, no support for rar compressed CBR) - FictionBook (fb2) Collaboration with electronic publication sites and access to online ebook catalogs is allowed by the supported OPDS protocol.