MariaDB: a robust SQL server, a fork of MySQL

Linux kernel: a UNIX clone written from scratch by Linus Torvalds

Wireshark: a network protocol analyzer

Dovecot: an open source IMAP and POP3 server for Linux/UNIX-like systems

libselinux: a library providing an interface for security-aware applications in SELinux

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

NetBeans: a full-featured cross-platform IDE written in Java

qBittorrent: a P2P BitTorrent client

libvirt: a toolkit to interact with the virtualization capabilities of the Linux kernel

Mozilla Thunderbird: a full-featured e-mail and newsgroup client

APT: a front-end for the dpkg package manager

iptables: enables the creation of packet alteration and firewall rules

Mozilla Firefox: a web browser for Windows, Linux, macOS, FreeBSD and Android

KDevelop: a C/C++ development environment

tmux: a terminal multiplexer

Mutt: a text-based MIME Email client

systemd: a system and service manager for Linux

GNU nano: a curse-based text editor for UNIX

cmake: a cross-platform, open-source build system

GTK: a multi-platform toolkit for creating GUIs