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Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.

Docomotion - Docomotion offers tools for designing and generating all types of transactional and operational business documents.

DjVuLibre - DjVuLibre: Open Source DjVu library and viewer

OpenKM - OpenKM is an easy to use powerful version control system that enables businesses efficiently and systematically capture, store, secure, manage, maintain and distribute corporate information assets with the goal of facilitating knowledge creation, op…

Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.