This is a great replacement console for the default Konsole which ships with KDE and implicitly with Kubuntu. The great thing about Yakuake is that is uses a Quake-style show/hide function, which can be accessed by default using the F12 keyboard shortcut. Press F12 to show the terminal, do you work, then hide it again when you don't need it anymore. Yakuake supports profiles (which can be configured the same way like a Konsole profile), global shortcuts, allows to change default size and animation speed, it supports skins, transparency, start-up options (like start with window shown or hidden), transparency. Supported are also multiple tabs, which can be switched by pressing Shift+Right/Left Arrow.
sudo apt-get install yakuake
BasKet - powerful notes taking application - full review
BasKet Note Pads is one of the applications that I fell in love with immediately after trying it, ever since it was available only for KDE3. For those who didn't try it yet, BasKet is feature-rich and powerful notes-taking application, but not only. It's not your ordinary notes application, it has much more to it. The workspace can organise your notes in one or more columns, or in custom (free) positions, it supports tags, inserting of images, links, launchers to applications or other disk locations, backup or restore BasKet archives, importing to various notes formats (included here are plain text files, KNotes, Sticky Notes, Tomboy), exporting to HTML file. The configuration window allows to enable/disable the system tray, configure global actions, animate changes in baskets, change the appearance of notes. All in all, if simple is not enough for you and a minimalist application like KNotes doesn't suffice, BasKet is definitely the KDE4 application for it, allowing to build complex projects rather than only text notes.
sudo apt-get install basket
BasKet 2.0 Beta
Kdenlive - powerful video editor
Kdenlive is a very powerful video editor for KDE4 which bundles a big number of video editing features. It comes with a wide range video and audio effects, support for camcorders and cameras, multitrack support, exporting to formats like PAL, NTSC, h264.
sudo apt-get install kdenlive
Krusader - full-featured file manager - full review
Ever since the KDE3 days Krusader was usually the first choice when someone would ask for a replacement for Konqueror. Krusader uses by default a twin-panel interface, and ships with all the whistles and bells one would expect from a complete file manager. It includes support for user actions, including creating archives, calculate checksums, split or combine files, mass rename of files, show previews, sort files by various properties, synchronise directories, search, locate, profiles, tabs, shortcuts, sessions, bookmarks. Krusader is also highly configurable.
sudo apt-get install krusader
Krusader 2.2.0 Beta
VLC - complete video player
In my opinion there are three major players for KDE: Kaffeine, SMPlayer and VLC, and all three are very good, and this time I chose VLC, one of the most popular movie players out there, and not only on the Linux platform. VLC offers anything you would expect from a media player, support for DVDs and HD formats, ISO DVD images, audio and video settings, bookmarks, subtitles, effects, plugins, playlists, minimal view mode. The preferences window allows to configure and change the way VLC looks and feels, OSD, volume normalization, hotkeys.
sudo apt-get install vlc
digiKam - photo management application
digiKam is the ultimate photo management application for KDE, with support for a wide range of cameras, importing from PicasaWeb, Facebook, SmugMug or a remote computer, and exporting to a variety of services. It organises photos in albums, itoffers image processing tools and effects, and it's highly configurable.
sudo apt-get install digikam
Clementine - KDE4 port of Amarok 1.4 - full review
Kubuntu comes with Amarok 2.2.0, but if you're happier with the look and feel of the older Amarok 1.4, Clementine is the perfect replacement. It offers an interface similar to the one of the KDE3 version of Amarok, and currently it integrates a pretty fair amount of features. Clementine comes with a file browser, radio support, Last.fm song submission, sortable playlists, cover manager, equalizer, cross-fading, tray icon integration, OSD, music library. Considering it isn't included in the Ubuntu Maverick repositories, here is a tutorial I've put up a while ago to install it.
Tutorial - Install Clementine in Kubuntu 10.10