Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. It is Sumatra PDF is powerful, small, portable and starts up very fast. Simplicity of the user interface has a high priority. It is an opensource viewer and the best thing for LaTeX coder is that it give you the ability to jump from PDF to LaTeX editor (inverse search). By double clicking on a line in PDF will take you to the respective line in TeX or LaTeX editor.