The best open source alternative to FBReader is SumatraPDF, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to FBReader and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to FBReader are calibre (Free, Open Source), Okular (Free, Open Source), Foliate (Free, Open Source) and Document Viewer (Free, Open Source).
Sumatra PDF is a slim, free, open-source PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI/FB2 viewer for Windows. Why another PDF reader? Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. Its small and starts up very fast.
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Most users think SumatraPDF is a great alternative to FBReader.
Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
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Almost everyone thinks calibre is a great alternative to FBReader.
KOReader is a document viewer for E Ink devices. Supported fileformats include EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI and ZIP files. It’s available for Kindle, Kobo, PocketBook, Android and desktop Linux.
v1.1.0 - PDF file association. - New PDF file icons. v1.0.0 - First release. - Tabbed View to easily switch between multiple documents. - Document Navigation Tools. - Thumbnail and Outline Panes. - Find, Go to, Zoom and Print.