Further KDE Packages

The most comprehensive guide to kf5 apps is probably in Arch, ​https://archlinux.org/groups/x86_64/kde-applications/ with brief summaries of what the package claims to do, links to home pages, and lists of dependencies.

Usually, Arch is slightly ahead of BLFS in versioning (we do not update for every new version of kf5, kf5-apps, or plasma) but the basic details probably change little from one version to the next, and if you look at their builds you can access the changes.