Inqlude provides a comprehensive listing of all existing libraries for developers of applications using the Qt toolkit. Inqlude is run by the community and open for contributions.
A library for accessing the usage data collected by the activities system.
The KActivitiesStats library provides a querying mechanism for the data that the activitiy manager collects - which documents hae been opened by which applications, and what documents have been linked to which activity. The activity manager also keeps the score for each document which gets higher when a particular document has been often accessed or kept open for longer periods of time. This score is also available through the querying mechanism.