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This list of Best Free Software for Linux now includes 151 apps in various categories. Among a plethora of freeware products, we have selected some gems in each category and added them to the list with clear and brief descriptions of each app.

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by Panzer on 21. February 2015 - 9:54  (121188)

"... Quassel IRC is a modern, cross-platform, distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core -- much like the popular combination of screen and a text-based IRC client such as WeeChat, but graphical ...":
http://www.quassel-irc.org/

by Panzer on 21. February 2015 - 9:48  (121187)
by Panzer on 18. February 2015 - 8:50  (121158)

docker-rpm-builder - build native RPM packages by leveraging docker capabilities:
https://github.com/alanfranz/docker-rpm-builder

by Panzer on 17. February 2015 - 8:21  (121147)

"... FossaMail is a free, open source, mail, news and chat client for Microsoft Windows and Linux (available in both 32-bit and 64-bit versions) based on Mozilla Thunderbird. It is a re-build of Mozilla Thunderbird ESR (Extended Support Releases) that has been optimized and reconfigured by the same developer behind Pale Moon browser ...":
http://www.fossamail.org/

by mrfingerz on 17. February 2015 - 4:59  (121145)

Evo/Lution an installer that installs Arch Linux with no additions or alterations.

http://www.evolutionlinux.com/

by Panzer on 16. February 2015 - 9:08  (121130)
by Panzer on 16. February 2015 - 8:52  (121129)

Pulsar is an torrent finding and streaming engine:
https://github.com/steeve/plugin.video.pulsar

by Panzer on 12. February 2015 - 9:22  (121077)

Pterosaur gives you the full power of Vim and your vimrc in each Firefox text field:
https://github.com/ardagnir/pterosaur#vim-info

"... Ever wanted to easily preview what your markdown would look like exactly on Github? Ever wanted to do that from inside of a Terminal? Well this Gem is for you. Dead simple. Never get caught writing ugly markdown again ... Octodown uses the same parsers and CSS that Github uses for their markdown rendering. Github markdown styling looks beautiful, so it is Octodown's primary goal to reproduce it as faithfully as possible ...":
https://github.com/ianks/octodown

by Panzer on 11. February 2015 - 9:42  (121073)

"... SLURM is an open-source resource manager designed for Linux clusters of all sizes. It provides three key functions. First it allocates exclusive and/or non-exclusive access to resources (computer nodes) to users for some duration of time so they can perform work. Second, it provides a framework for starting, executing, and monitoring work (typically a parallel job) on a set of allocated nodes. Finally, it arbitrates contention for resources by managing a queue of pending work ...":
https://computing.llnl.gov/linux/slurm/

by Panzer on 11. February 2015 - 9:35  (121071)

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information:
http://optipng.sourceforge.net/

by Panzer on 11. February 2015 - 9:26  (121069)

"... The virt-manager application is a desktop user interface for managing virtual machines through libvirt. It primarily targets KVM VMs, but also manages Xen and LXC (linux containers). It presents a summary view of running domains, their live performance & resource utilization statistics. Wizards enable the creation of new domains, and configuration & adjustment of a domain’s resource allocation & virtual hardware. An embedded VNC and SPICE client viewer presents a full graphical console to the guest domain ...":
http://virt-manager.org/

by Panzer on 11. February 2015 - 8:30  (121060)

"... Mibibli's Quest - It's been called "Mega Man + Space Funeral," and that's probably as good of a description as anything I could come up with. It includes over 20 painstakingly-made levels each with their own themes, enemies, bosses, and gimmicks ... but it's a Flash game so if you're on Linux then you can download either non-Linux package and just open the .swf file using Flash Player ...":
http://gamejolt.com/games/platformer/mibibli-s-quest/45676/

by Panzer on 10. February 2015 - 9:27  (121042)

"... TMSU is a tool for tagging your files. It provides a simple command-line tool for applying tags and a virtual filesystem so that you can get a tag-based view of your files from within any other program.

TMSU does not alter your files in any way: they remain unchanged on disk, or on the network, wherever you put them. TMSU maintains its own database and you simply gain an additional view, which you can mount, based upon the tags you set up. The only commitment required is your time and there's absolutely no lock-in ...":
http://tmsu.org/

by Panzer on 5. February 2015 - 9:56  (120967)

mhddfs - the driver combines several mount points into the single one:
http://svn.uvw.ru/mhddfs/trunk/README
http://mhddfs.uvw.ru/downloads/

by Panzer on 3. February 2015 - 9:24  (120928)

lighthouse - a scriptable popup dialog:
https://github.com/emgram769/lighthouse

by Panzer on 2. February 2015 - 9:29  (120910)

Calamares is a distribution independent installer framework:
https://github.com/calamares/calamares/releases/tag/v1.0.1

by Panzer on 31. January 2015 - 9:18  (120866)

"... Gotalk exists to make it easy for programs to talk with one another over the internet, like a web app coordinating with a web server, or a bunch of programs dividing work amongst eachother ...":
https://github.com/rsms/gotalk

by Panzer on 30. January 2015 - 9:46  (120842)

SWATd lets you configure 'sensors' that check your PC's external environment. When enough sensors 'fail', SWATd will run a script for you:
https://github.com/defuse/swatd

by Panzer on 29. January 2015 - 9:33  (120821)

"... libguestfs is a set of tools for accessing and modifying virtual machine (VM) disk images. You can use this for viewing and editing files inside guests, scripting changes to VMs, monitoring disk used/free statistics, creating guests, P2V, V2V, performing backups, cloning VMs, building VMs, formatting disks, resizing disks, and much more ... libguestfs can access almost any disk image imaginable. It can do it securely — without needing root and with multiple layers of defence against rogue disk images. It can access disk images on remote machines or on CDs/USB sticks. It can access proprietary systems like VMware and Hyper-V ...":
http://libguestfs.org/

by Panzer on 28. January 2015 - 9:59  (120807)

"... Pygments - a generic syntax highlighter suitable for use in code hosting, forums, wikis or other applications that need to prettify source code ...":
http://pygments.org/

by Panzer on 22. January 2015 - 9:26  (120701)

Text to Speech engine for English and many other languages:
http://sourceforge.net/projects/espeak/

Tfman - text file manager:
https://chiselapp.com/user/machel/repository/tfman/doc/tip/doc/md/wiki_h...

by Panzer on 21. January 2015 - 10:34  (120694)

"... Naut - Is there life on Mars? Wander around, drive through the desert, hear what the cosmos has to tell you ...":
http://evilion.itch.io/naut

by Panzer on 21. January 2015 - 8:55  (120692)

Rage is a video and audio player written with Enlightenment Foundation Libraries with some extra bells and whistles:
https://www.enlightenment.org/p.php?p=about/rage

Navi-X is a "content aggregator" app that streams multimedia content on the internet from a public directory of user contributed links and site scrapers on to your TV, PC and mobile devices:
https://code.google.com/p/navi-x/

wtftw - a tiling window manager written in Rust:
https://github.com/Kintaro/wtftw

UNTV is a cross platform DRM-free media platform for home theater computers:
https://github.com/untv/untv

Showtime is a media center primarily intended to be used directly on a TV:
https://showtimemediacenter.com/projects/showtime

KShutdown is a graphical shutdown utility:
http://kshutdown.sourceforge.net/

Dolphin Folder Color - extension for Dolphin file manager that lets you change the coloring of your folders:
http://kde-apps.org/content/show.php/Dolphin+Folder+Color?content=164008

Whisker Menu is an alternate application launcher for Xfce:
http://gottcode.org/xfce4-whiskermenu-plugin/

QMPlay2 Media Player:
http://sourceforge.net/projects/zaps166/

budgie - a GNOME3.10 media player written in C:
http://ikeydoherty.github.io/budgie/

Fresh Pepper Player is a a wrapper package which uses Google Chrome’s Pepper-based Flash plugin in Mozilla Firefox:
https://github.com/i-rinat/freshplayerplugin

freetuxtv - the goal of this project is to create a WebTV player, working on the Linux platform:
https://code.google.com/p/freetuxtv/wiki/HomePage?wl=en

ScriptCommunicator - send and receive data with several interfaces:
http://sourceforge.net/projects/scriptcommunicator

by uriegel on 26. February 2015 - 6:59  (121237)

I have used several serial terminals before. But ScriptCommunicator is the best I've ever used. Because of it's script interface it's extremly flexible and powerful.

by Panzer on 20. January 2015 - 9:17  (120661)

"... I-Nex is an application that gathers information for hardware components available on your system and displays it using an user interface similar to the popular Windows tool CPU-Z ...:"
http://i-nex.linux.pl/about/
http://i-nex.linux.pl/install/

by vandamme on 20. January 2015 - 15:38  (120674)

i-nex gives an impressive amount of hardware information displayed in an easy to read format.
I couldn't install the stable version on Mint 17.1 because of dependencies, but the daily version installed and ran well.

by Jojo Yee on 20. January 2015 - 10:32  (120662)

Thanks Panzer for the various suggestions. I-Nex has now been added to the list.

by Panzer on 20. January 2015 - 8:49  (120660)

"... Drake is a simple-to-use, extensible, text-based data workflow tool that organizes command execution around data and its dependencies ...":
https://github.com/Factual/drake

blessed-contrib - build dashboards (or any other application) using ascii/ansi art and javascript:
https://github.com/yaronn/blessed-contrib

by Panzer on 19. January 2015 - 9:49  (120638)

"... bomi is a multimedia player formerly known as CMPlayer, which is aimed for easy usage but also provides various powerful features and convenience functions ...:"
http://bomi-player.github.io/

by Panzer on 19. January 2015 - 9:09  (120636)

CCExtractor - a tool that analyzes video files and produces independent subtitle files from the closed captions data:
http://ccextractor.sourceforge.net/about-ccextractor.html

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