Documentation
These are the manual and articles that are officially part of the AngelScript SDK.
Manual
Application Writer's manual
This is the reference manual that describes the programming library and the script language.
Change list
Change list
This is the change list for all the releases of the library.
Offline documentation
I haven't prepared any offline documentation besides the html documentation that is included in the SDK and also available online. If you prefer to use offline documentation then you can easily generate it yourself from the Doxygen source available in the SVN repository.
http://svn.code.sf.net/p/angelscript/code/trunk/sdk/docs/doxygen/
Use your favorite SVN client to download it, or else go to the SourceForge.net project page and download a tar ball.
Using Doxygen you can then generate offline documentation as compiled html help (.chm), pdf, or Docsets compatible with Dash or Zeal.