the Free Software Foundation Europe recommended Sumatra PDF, but then removed its recommendation in February 2014, due to the presence of the non-freely licensed unrar code in Sumatra. Foundation representative Heiki Ojasild explained, "while they continue to make use of the non-free library, SumatraPDF cannot be recognised as Free Software". Unrar was eventually replaced with a free alternative in version 3.0, making it 100% free software. See also List of PDF software List of portable software References External links EPUB readers Free PDF readers Free software programmed in C++ Portable software Software using the GPL license Windows-only free software