Sumatra PDF - PDR Reader SumatraPDF is a compact PDF reader, it can show ePub, mobi, chm and other document formats as well. There is a 32bit and a 64 bit version for Windows. It is free software licensed under GNU GPL v3. The development is mainly in C++. The homepage is sumatrapdfreader.org SumatraPDF can be used as portable application. There is a version for PortableApps. https://portableapps.com/apps/office/sumatra_pdf_portable The development started in 2006 with version 0.1. The latest release is 3.1.2 from Aug 2016. In total 43 releases have been published. This is an enormous achievement in 11 years. But the last release Sumatra Commits Sumatra commits per month: 2007 - 2018 The commits begin with the first one in July 2007 by Krzysztof Kowalczyk (blue color). He founded this project. Development was steady ongoing. The activity increased a lot when a second developer joined 2 years later in July 2009, zeniko (green color). They worked together for nearly 7 years a...