Here is a list of all related documentation pages:

Builtin tags and filters.
Handling custom QTextObjects
Differences between Django and Grantlee
Examples of Grantlee use
Extending the template system
Grantlee for application developers
Grantlee for theme artists
Generic type and template support
Internals
Internationalization and Localization
Porting from Qt4-based Grantlee
Using Grantlee in your application
Todo List