See the red banner on https://apps.kde.org/powerplant. But it isn't unmaintained, it's a new app that simply hasn't had a release yet. Because of this, perhaps it shouldn't be listed on apps.kde.org yet... but it certainly shouldn't be listed there as unmaintained.
This might have been fixed with https://invent.kde.org/sysadmin/repo-metadata/-/commit/8a4c4552518aaf110413cc42082072489dc0013c perhaps the site is not up to date
Same thing for marknote, which is also a new app
Besides what I've explained in https://bugs.kde.org/show_bug.cgi?id=469807, the "unmaintained" category of apps.k.o is also used to list apps whose categories cannot be determined. Each app should be in at least one category on apps.k.o, so if the categories of an app cannot be determined, the app is hidden in that "unmaintained" category waiting for its appdata/desktop file to be fixed. The categories of an app are gotten from both "categories" fields of its appdata and desktop files. Possible values for categories are listed in https://specifications.freedesktop.org/menu-spec/latest/apa.html. Other than apps that are manually listed as unmaintained in the apps-k-o repo, the "unmaintained" category now has 4 apps: powerplant, marknote, klevernotes, and kolorfill. The last one does have a "categories" value https://invent.kde.org/games/kolorfill/-/blob/master/src/org.kde.kolorfill.desktop#L95, but it's invalid: it should be "Game" instead of "Games". The first three don't have any suitable "categories" value. After such a value is added, the app will disappear from the "unmaintained" category and appear in the list on the home page as well.
Thanks. Perhaps we need a separate "Uncategorized" category. Definitely we should fix our own apps' metadata, but until that happens, putting them in the "Unmaintained" section seems misleading. I'll see if I can get them fixed today.
(In reply to Nate Graham from comment #4) > Thanks. Perhaps we need a separate "Uncategorized" category. Definitely we > should fix our own apps' metadata, but until that happens, putting them in > the "Unmaintained" section seems misleading. > > I'll see if I can get them fixed today. You are right, I've created an Invent issue to track that https://invent.kde.org/websites/apps-kde-org/-/issues/31
Hah, looks like Carl beat me to it. All of those apps now have proper categories listed. So this should be fixed as soon as the website notices those changes.