LibreSSL: an implementation of SSL and TLS protocols, forked from OpenSSL

KMyMoney: a personal finance manager for KDE

Perl: Larry Wall's Practical Extraction and Reporting Language

Calibre: an e-book library management application

GStreamer: a multimedia framework with a plugin-based architecture for a variety of platforms

MPlayer: a movie and animation player

K3b: a KDE-GUI for cdrecord and cdrdao, similar to Nero

Qt: a C++ application framework for writing graphical applications

LibreOffice: a free personal productivity suite

OpenSSH: a client and server for encrypted remote logins and file transfers

GNOME Shell: a core user interface of the GNOME 3 desktop

Ruby: interpreted, dynamically typed, pure object-oriented scripting language

VirtualBox: a family of x86 virtualisation products for enterprise and home use

SQLite: an embeddable SQL engine in a C library

apache-tomcat: a Java Servlet and JSP Container

Synaptic: a graphical front-end for APT

Qt Creator: a cross-platform IDE tailored to the needs of Qt developers

Digikam: an advanced digital photo management application

ImageMagick: a software suite to create, edit, and compose bitmap images

GNU Emacs: the extensible, self-documenting real-time display editor