Kdenlive

Kdenlive is a free and open-source video editing software based on the MLT Framework, KDE and Qt. The project was started by Jason Wood in 2002, and is now maintained by a small team of developers. ...
Language(s): C++ (Qt, KF5)
Operating system(s): Windows, Mac OS X (source code only)
License: GNU GPLv2+

KeePass

Today you need to remember many passwords. You need a password for the Windows network logon, your e-mail account, your website's FTP password, online passwords (like website member account), etc. etc...
Language(s): C# (2.x version), C++ (1.x version)
Operating system(s): Windows Vista and later
License: GNU GPLv2+

Kiten

Kiten is a Japanese Kanji learning tool and reference for the KDE Software Compilation, specifically, in the kdeedu package. It also works as a Japanese-to-English and English-to-Japanese dictionary. ...
Language(s): C++
Operating system(s): Linux, Windows
License: GNU General Public License

Kontact

Kontact is a feature-rich persndent entire documentenal information management suite created by KDE. Kontact unifies all our PIM applications into a single window so that you can deal with your emails...
Language(s): C++
Operating system(s): Unix, Linux, Windows
License: GNU GPLv2+

Krita

Krita is a FREE and open source painting tool designed for concept artists, illustrators, matte and texture artists, and the VFX industry. Krita has been in development for over 10 years and has had a...
Language(s): C++, Qt
Operating system(s): Unix, Linux, Windows, Mac OS
License: GPLv2 or later.