It should be stressed that the above is but a preview of what is available in the KDE extragear. To view all of the applications and utilities available there visit https://extragear.kde.org, where a briefer summary of each application is provided.
The handbooks for the majority of applications in extragear can be viewed from https://docs.kde.org.
Once again, you can find a plethora of other [third-party] KDE applications at the popular https://kde-apps.org.
