Here is a list of all topics with brief descriptions:

Database	Classes and functions for storing and indexing of OSM objects into db-like on-disk data structures
High level services	Services offer a application developer targeted interface for certain topics like handling of POIs, location search, routing,..
Description	Classes and functions for structured descriptions of objects on the map
Object type related data structures and services
Platform independent file access	Classes and methods related to low-level platform independent access to files on disk
Location related data structures and services	Classes and methods for handling location aspects of object in the libosmscout db
Logging	A logger is a special output stream, that is used by the library
NavigationEngine	Collection of classes and methods to create a navigation engine
Routing based data structures and services	Classes and methods for handling routing aspects of object in the libosmscout db
Geometric helper	Collection of classes and methods related to low level geometric stuff
lane turn helpers	Collection of utilities for dealing with route lane turn variants
Utility stuff	General utility stuff like enhanced string operations, special data structures..
Classes for caching map data per tile
classes for handling OSM Tiles	Class for representing OSM tiles and other data structures build on top of them
Map rendering	Classes and methods related to rendering of maps
Stylesheet definition	Classes and methods related to stylesheet definition for the renderer
Qt API	Classes for integration osmscout library with Qt framework