Sumatra PDF is a slim, free, 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.

Pros:

• Easy installation.
• Lightweight PDF reader.
• A functional, minimalistic GUI.
• Command line capability.
• Organized manual for keyboard shortcuts.
• Decrease in execution time.
• Open Source.

Cons:

• Sometime takes a moment to load pages.
• User interface a little medieval.
• Fewer tools to play with.

It is recommended to those who are looking for quality PDF reader to replace insecurities with Adobe Reader and Foxit Reader (and the annoying ask toolbar).