The documentation about iTop is available online in the iTop Wiki:

http://sourceforge.net/apps/mediawiki/itop/index.php?title=Main_Page

PDF documents

The following PDF documents are also available to download:

In English

 iTop 1.0 user guide
 iTop 1.2 administration guide
 Customizing iTop 1.0
 iTop implementation guide
 How to setup authentication for iTop
 Localizing iTop
 OQL Reference Guide
 Step by step example of customization

In German

 iTop HandBuch (by ITOMIG)