VisiScript is a visual frontend for script languages.
For API documentation, point a web browser at /opt/Qtopia/doc/html/qtopia/index.html
$QPEDIR/help/html/appname.html
Put non-English documentation for applications in:
$QPEDIR/help/lang/html/appname.html
Where lang is the language specifier (eg. "de" for German), and appname is the program name of your application.