KWin (pronounced as one syllable "kwin") is the window manager for the KDE Plasma Desktop. It gives you complete control over your windows, making sure they're not in the way but aid you in your task. It paints the window decoration, the bar on top of every window with (configurable) buttons like close, maximize and minimize. It also handles placing of windows and switching between them.

Proxy chains force any tcp connection made by any given tcp client to follow through proxy (or proxy chain). It is a kind of proxifier. It acts like sockscap / premeo / eborder driver ( intercepts TCP calls )

This library can be used to classify files according to magic number tests. It implements the core functionality of the file command.

FFMpegThumbs is a video thumbnail generator for KDE file managers like Dolphin and Konqueror. It enables them to show preview images of video files using FFMpeg.

This is a collection of useful tools that Ubuntu developers use to make their packaging work a lot easier.

Qmmp is feature-rich audio player with support of many formats. It is written in Qt.