Sumatra PDF is a open-source PDF viewer for Windows. Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It's small and starts up very fast. It's designed for portable use: it's just one file with no external dependencies so you can easily run it from external USB drive. You can read PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, and comic books.
What's new in this version:
- (re)add support for old processors that don't have SSE2
- support newer versions of unrar.dll
- allow keeping browser plugin if it's already installed
- crash fixes