Foxit Reader is the only eligible alternative reader/viewer for PDF files (eBooks).
It's smaller, faster, and cleaner. And it starts up immediately, so you don't need to wait the annoying "Welcome" screen to disappear.
Foxit PDF Reader is extremely easy to use, just double click it to start and then click open button to open your PDF document.
If you want to print, click on "Print" button. If you want to setup the page layout for printing, select "Print Setup" from "File" menu. Foxit Reader supports Windows 98/Me/2000/XP/2003/Vista

Unlike Adobe® Reader, this one has size about than 2.5 MB, needs no installation and opens up immediately. You don't need to go throught lengthy installation process to start using Foxit PDF Reader, just UNZIP the downloaded "pdfrd.zip" package into any place you want, then run PDFReader.exe. You can set Foxit PDF Reader as your default PDF reader, so you can double click on PDF files to open them within Foxit PDF Reader.

Now with Foxit Reader, you don't have to endure such pain any more. The following is a list of compelling advantages of Foxit Reader:
Incredibly small: The download size of Foxit Reader is only 2.5 MB which is a fraction of Acrobat Reader 20 MB size.
Breezing-fast: When you run Foxit Reader, it launches instantly without any delay. You are not forced to view an annoying splash window displaying company logo, author names, etc.
Annotation tool: Have you ever wished to annotate (or comment on) a PDF document when you are reading it? Foxit Reader allows you to draw graphics, highlight text, type text and make notes on a PDF document and then print out or save the annotated document.
Text converter: You may convert the whole PDF document into a simple text file.
High security and privacy: Foxit Reader highly respects the security and privacy of users and will never connect to the Internet without users' permission. While other PDF readers often silently connect to the Internet in the background. Foxit PDF Reader does not contain any spyware.

Foxit Reader Pro is the professional version of Foxit Reader, the popular free PDF reader.
Foxit Reader Pro supports all features provided in Foxit Reader, and includes the following functions:
Annotation
Text viewer and text converter
Form filler
Spell checker
Advanced editing tools, including loupe tool, measure tools, image tool, file attachment tool, link tools, annotation selection tool, and more

Actually without Pro Pack, you are still able to annotate a PDF document and print it out. However when you save the annotated document, it will be stamped with an evaluation mark on the top-right corner of the annotated pages. If you purchase a Pro Pack add-on, then there will be no evaluation mark.

What's new in Version 2.3:
Bookmark Design: Makes it possible to have your own bookmarks. Users can create, edit, or delete bookmarks in a PDF file if the security settings allow.
Multi-tab Browsing: Enables users to open multiple files in a single instance.You can choose to view PDFs in a multi-tab window or multiple instances by setting documents layout from the Preferences dialog.
Multimedia Player Support: Supports many media formats including audio and video. Read multimedia ebooks with Foxit Reader 2.3.
Callout and Text box Tool: Creates comments in a callout text box or a box. You can also define their appearance as other commenting tools.
Commenting Text Tool: Enables users to add most types of text edits by right-clicking on the selected text, including highlight, strikeout, underline, squiggly and replacement. You can also use the Commenting Text Tool to add bookmarks for PDF files.
Rulers and Guides: Provides horizontal and vertical ruler guides to help users align and position objects on the page. Right-clicking on the ruler enables you to change the unit of measurement.
Magnifier: Magnifies areas of the PDF files easily as you work on Foxit Reader.
Automatic Scrolling: Allows users to view documents without using mouse actions or keystrokes.
OCG Support: Enables the user to view related content stored in a variable number of separate layers.
FDF Related: Opens FDF files directly with Foxit Reader without any import implementations.

Enhanced features:
Optimized Rendering:Supports progressive rendering and significantly reduces the response time from the user interface events.
Improved Link Tools:Allows users to add actions to links, such as go to a page view, open or execute a file, open a web link, etc.
Improved Snapshot:Enables users to print the selected area in Foxit Reader by simply selecting the Print option from the context menu.
Search Enhancement:Allows users to float, move and resize the Full Foxit Search box.
Better Annotation control:Groups drawing markups to help users operate objects collectively, and allows users to move annotations through pages.
Font Information:Lists the fonts and the font types used in the original document in the Properties dialog.
Updated Command Line:Allows users to open password protected PDF documents with a simple command prompt.
Streamlined UI:A completely redesigned UI with a new look and feel makes Foxit Reader more intuitive than ever before.

Available for users only