System

A shell designed for interactive use, although it is also a powerful scripting language.
The friendly interactive shell that attempts to be more interactive and user-friendly than former shells.
Terminal emulator with International language support through Unicode, displays multiple font types and support for Perl extensions.
Simple but powerful libvte based terminal emulator, supporting utf-8 and input methods as provided by gtk+ and pango libraries.
Provides tools and drivers for monitoring temperatures, voltage, and fans.
An interactive system-monitor that shows a frequently updated list of running processes.
A highly configurable system monitor.
Clean your system and free disk space. Deletes cache, cookies, history, temp files, logs, and junk.

Security

Allows a system administrator to configure the tables provided by the Linux kernel firewall.
Builds secure, stateful firewalls from easy to understand, human-readable configurations.
DNSCrypt
A protocol to improve DNS security. It prevents DNS spoofing and uses cryptographic signatures.
A discontinued source-available freeware utility used for disk encryption.
A lightweight and easy-to-use password manager. Strong security, portable, multiple user keys, and password generator.
Save your passwords and keep everything organized in your LastPass vault.

Internet

Open-source web browser developed by the Mozilla Foundation.
Closed-source web browser developed by Google.
Open-source web browser project from which Google Chrome draws its source code.
decentraleyes
Protects you against tracking through free, centralized, content delivery.
Ad Blocker that's easy on memory and CPU, yet can load thousands more filters than other popular blockers.
Browser extension that encrypts your communications with many major websites.
Blocks malicious scripts and allows JavaScript and Java content only from sites you trust.
privacybadger
Automatically analyze and block any tracker or ad that violates the principle of user consent.
Global Domain Name System resolution service that you can use as an alternative to your current DNS provider.

Production

Free, open-source office suite and compatible alternative to Microsoft Office.
High-quality typesetting system designed for the production of technical and scientific documentation.
GTK+ text editor that emphasizes simplicity.
Professional, free and open-source 3D graphics and animation software.
Free and open-source raster graphics editor used for image retouching and editing, free-form drawing.
Free, open-source program for drawing and image editing.
Digital painting application based on Qt 5 and the KDE Frameworks 5.
Create vector graphics such as illustrations, diagrams, line arts, charts, logos and complex paintings.
Professional layout and publishing software supporting EPS and SVG import/export, and PDF support.
Free and Paid video editor supporting resolutions up to 4K.
Open-source, non-linear video editor.
Cross-platform music production software combining the features of trackers, sequencers and synthesizers.
Free, easy-to-use, multi-track audio editor and recorder.

Media

MPV
Minimal, powerful media player that's highly customizable.
VLC
Multimedia player and framework that plays most multimedia files and doesn't require codec packs.
MPD
A flexible, powerful, server-side application for playing music.
MOC
Console audio player designed to be powerful and easy to use.
Small, fast and powerful console music player
Record, convert and stream audio and video.
feh
Image viewer aimed mostly at console users. Unlike most other viewers, it does not have a fancy GUI, but simply displays images.
plex
Organizes your video, music, and photo collections and streams them to all of your screens.

Utilities

Lightweight desktop independent archive manager.
Archive compression utility that supports multiple formats.
Universal document viewer based developed by KDE.
Software suite to create, edit, compose, or convert bitmap images.
Advanced clipboard manager with editing and scripting features.
Linux file search, instant results as you type.
The Bash Screenshot Information Tool.
A gesture-recognition application for movements you make with your mouse, pen, finger etc.
Meant to be the simplest dock on the planet.
Open-source wallpaper changer packed with great features, while slim and easy to use.
Remote Desktop application that uses a video codec specifically designed for graphical user interfaces.
Provides fast incremental file transfer.
Provides data protection including, backup, archive, access and recovery.
Deduplicating backup program. Optionally, it supports compression and authenticated encryption.
Computational knowledge engine and answer engine.

Gaming

Delivers a range of games straight to a desktop with automatic updates.
GOG
A vast selection of classic and new games, DRM-free.
G2A
Buy and sell legit game CD-Keys for Steam, Origin, Uplay, Battle.net, Xbox, PSN and more.
Graphics card drivers.
Graphics card drivers.
Graphics card drivers.
Parallel programming specification developed by the Khronos Group.
OpenGL benchmark test for measuring the performance of a graphics card.
Open-source program for recording and live streaming. Stream to Twitch, YouTube and many other providers.

Communication

Open-source, cross-platform email, news, and chat client developed by the Mozilla Foundation.
Voice and text chat app designed specifically for gaming communities.
Open-source, low-latency, high quality voice chat.
Voice chat for online gaming, education and training, internal business communication .
Video chat, text messaging and voice calls.
Mssaging app with a focus on speed and security.
Easy, fast and secure remote access to Windows, Mac and Linux systems.
retroshare
Secure chat and file sharing features. Includes screenshots, a wiki and support forum.

Development

An easy to install Apache distribution containing MariaDB, PHP and Perl.
Open-source, full virtualizer for x86 hardware, targeted at server, desktop and embedded use.
Hosted hypervisor that runs on x64 versions of Windows and Linux operating systems.
Ubuntu edition configured for web server. Can be installed in a virtual machine.
A free rebuild of source packages from the Red Hat Enterprise Linux.
The Stable Linux distribution is one of the most popular for personal computers and network servers.
Supports enterprise-level management, data storage, applications, and communications.
The Official IDE for Android. Provides the fastest tools for building apps on every type of Android device.
xamagon
Build & design a mobile app using cross-platform development software which simplifies mobile application creation.
Cloud computing platform for deploying applications and services through Microsoft-managed data centers.
Simple cloud computing web host, built for developers, pay-as-you-use based model.
Free, open-source FTP solution for both client and server.

Programming

Extensible, customizable, self-documenting real-time display editor,
Vim
An improved version of the vi editor distributed with most UNIX systems.
IDE primarily intended for development in Java, but also supports other languages.
IDE primarily intended for development in Java, but also supports other languages, in particular PHP, C/C++ and HTML5.
C, C++ and Fortran IDE built around wxWidgets, designed to be extensible and configurable.
A sophisticated text editor for code, markup and prose. Use with Package Control.
Text editor redefined and optimized for building and debugging modern web and cloud applications.
Text editor that's modern, approachable, yet hackable to the core. Full-featured, right out of the box.
General-purpose programming language that is concurrent, class-based, object-oriented.
PHP
Server-side scripting language designed for web development.
High-level, general-purpose, interpreted, dynamic programming language.
High-level, general-purpose, interpreted, dynamic programming language. Commonly used with Django and Flask frameworks.
A dynamic programming language with a focus on simplicity and productivity. Commonly used with Rails framework.
Event-driven I/O server-side JavaScript environment based on V8.

Plugins & Runtimes

Allows applets written in the Java programming language to run inside various browsers.
Views content created with Adobe Flash, including Internet applications, and streaming video and audio.
A wrapper for using Windows plugins in Linux browsers, allowing you to access services which are otherwise not available.