GNU Grep: a program to search for strings inside a file

GNUCash: an open source personal finance suite

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

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

Calibre: an e-book library management application

PostgreSQL: a relational database management system

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

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

OpenSSL: a library for providing encrypted transport layers

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

Mozilla SeaMonkey: a web browser, e-mail and newsgroup client, IRC chat client, and HTML editor

IceWM: an X Window manager that emulates the looks of Motif, OS/2 and Windows

Mesa: a 3D graphics library

Samba: a free software re-implementation of SMB/CIFS networking protocol

GNU Binutils: an essential collection of binary utilities

Docker: a program that performs operating-system-level virtualisation, also known as "containerisation"

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

ISC BIND: an implementation of the Domain Name System (DNS) protocols

Eclipse: a universal tool platform and IDE

Opera: a light-weight graphical web browser