Okular

Introduction

PDF Reader for Linux/Windows.

Download

From here.

User Guides

Ctrl+1: Browser mode, the inserted text area is dragable;
1~9: Customized shortcut keys for highlighters and inserters.
F1: The Okular handbook online.
F3: Find something in this document.
F5: Reload the document.
F6: Annotation tools.
F7: Hide/Show the side thumbnails pannel.