Next week, KDE developers will release the beta of KDE Applications 17.08. This release will again have more applications and nearly all games ported to Qt5/KF5. While Qt4 is already no longer supported for over a year, KDE has decided to support Qt4/kdelibs4-based applications a bit longer.
The 17.08 release, however, will be the last to include Qt4/kdelibs4-based applications. This means, 17.12 will only include applications that are based on Qt5/KF5. See this mailing list discussion.
We hope to find more contributors who help porting the remaining applications. Instructions are on community.kde.org. Ask for help in our developer forum, mailing list, or IRC channel. You do not need git commit rights; you can add a patch/diff via Phabricator.
This week, I had the chance to run its script over a checkout of nearly all KDE repositories from cgit.kde.org. Unfortunately, the repository layout is not nicely structured into directories, and includes many unmaintained and playground repositories, but maybe it is still useful.
For contributors helping to get it more green, there is also a shorter version that omits all-green repositories, see portingstatus-todo.html.