Krusader is an advanced twin panel (commander style) file manager for KDE and other desktops in the *nix world, similar to Midnight or Total Commander. It provides all the file management features you could possibly want

Skrooge allows you to manage your personal finances, powered by KDE 4.x. Thanks to its many features, it is one of the most powerful way to enter, follow, and analyze your expenses.

KWordQuiz is a general purpose flash card program. It can be used for vocabulary learning and many other subjects.

KMyMoney

the BEST Personal Finance Manager for FREE Users, full stop.

The ultimate objectives of KMyMoney are...

Accuracy. Using time tested double entry accounting principles KMyMoney can help ensure that your finances are kept in correct order.
Ease of use. KMyMoney strives to be the easiest open source personal finance manager to use, especially for the non-technical user.
Familiar Features. KMyMoney intends to provide all important features found in the commercially-available, personal finance managers. The current release is closer than ever to that goal and more improvements are already planned or being tested.

This project aims to keep the KDE3.5 computing style alive, as well as polish off any rough edges that were present as of KDE 3.5.10. Along the way, new useful features will be added to keep the environment up-to-date.

Toward that end, significant new enhancements have already been made in areas such as display control, network connectivity, user authentication, and much more!

NOTE: This project is not an official continuation of KDE3.5 by KDE e.V., which will not be creating new releases of the KDE3 series. This is an independent fork using a largely separate developer community.

KBiff is a "biff" or new mail notification utility. It is highly configurable but very easy to use and setup. It tries to combine the best of the features of most of the "other" biff programs out there.

KRename is a powerful batch renamer for KDE. It allows you to easily rename hundreds or even more files in one go. The filenames can be created by parts of the original filename, numbering the files or accessing hundreds of informations about the file, like creation date or Exif informations of an image.

Due to the lack of a good cdda extraction tool with view on archival funtions, audex is a new audio grabber tool for CD-ROM drives based on KDE 4.
Although it is still under development, it is published as a beta version. It is being tested by some testers and this program may change on the way to its first stable 1.0-release.

One of the best known KDE BibTeX frontends is KBibTeX, developed by Thomas Fischer. KBibTeX sports many interesting features, including handy integration with Kile, an integrated editor for LaTeX built on the KDE Platform. KBibTeX is built on KDE 3.5; a port to KDE Platform 4 is in progress.

Luca Beltrame took the opportunity to ask Thomas about KBibTeX, the KDE Platform, science and KDE. Read on for his thoughts and to find out what the KDE Science team can do for you.

soundKonverter is a frontend to various audio converters.

The key features are:
- Audio conversion
- Replay Gain calculation
- CD ripping

Kdenlive is an intuitive and powerful multi-track video editor, including most recent video technologies. Our software is completely free, as defined by the GNU foundation.

KPlayer is a KDE multimedia player. With KPlayer you can easily play a wide variety of video and audio files and streams using a rich and friendly interface that follows KDE standards.

This applet shows a departure / arrival board for a given stop. It can also show journeys to or from the given "home stop". It displays additional information like delays, news about journeys, routes, vehicle types (with icons).
It gets it's information by parsing HTML/XML files from the web. You can get data for public transport, trains, ferries and planes (using flightstats.com).

Kalzium is an application which will show you some information about the periodic system of the elements. Therefore you could use it as an information database.

KTouch is a program for learning how to touch-type