Below is a list of the applications I use regularly. I don’t claim they are the best but they are the ones I prefer. Many are KDE based but there are fewer of them than previously. I use both KDE and Xfce as my desktop environments. The apps that come with Xfce are pretty basic so I prefer alternatives.
One of the complaints I have about many of KDE’s apps it that they have been combined with KDEpim which means you can’t install single apps. If you don’t use Kmail and its brethren then I would avoid Blogilo and Kjots, both of which I have previously used.
Chrome / Chromium is my browser of choice. Not perfect, it doesn’t integrate into the desktop too well. But it is fast and has the main extensions I like.
Conky – just calling Conky a system monitor really understates what it can do. Conky can do so much that it requires its own post. Since it introduced real transparency it greatly reduced the problems running it under KDE. One of the first things I set up on a new installation.
Krusader – twin pane file manager. Dolphin is good especially with the split feature but I like the power and retro style of Krusader. I’ve tried others like Midnight Commander which is quite good but nothing comes close to Krusader.
Gimp – it is all you need to edit images. To work with raw files just add ufraw and ufraw-gimp.
Digikam – adds digital asset management aka photo organiser. Has editor which works better for raw images than ufraw but I prefer Gimp. Has export to almost anything you can think of.
Cups-pdf – while Koffice and LibreOffice can create PDFs adding cups-pdf allows you to create them from anything that can print.
Kdenlive – the most stable video editor under Linux. A good balance between power and ease of use. Not perfect but there is nothing better at the moment.
Tilda – a drop down terminal emulator. Makes accessing the terminal so easy and you can hide it and let it get on with what is doing. KDE provides Yakuake which has many options and is a great application.
LibreOffice – the most polished FOSS office suite there is. If only Base was up to the standard of the rest of the suite.
Clementine – what can I say, can’t work without some music. A good mix of features and performance.
Zim – note taker / desktop wiki. I used Kjots for a while but it was integrated into KDEPim which meant it was near impossible to sync it between 2 systems so I switched to Zim. Just as good maybe better but I don’t use all its features and it has fewer dependencies.
So that is it. There are other applications that I use from time to time which work well too, things like Yumex and VLC but the ones above are those I like and use nearly every day. They are all available in Kororaa, a couple require extra repos to be installed in Fedora though.