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The following list contains links to software projects which may be used for free (also commercially). In most cases, those are Open Source products that are contributed to and maintained by a community of voluntary developers. In the future, this list will be extended continuously ;).

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Live Linux Distributions

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Debian/Ubuntu/Lubuntu

Parrot*: https://www.parrotsec.org

Kali*: https://www.kali.org

Samurai-WTF: https://www.samurai-wtf.org

Demon: https://demonlinux.com

Forlex: https://www.forlex.it

Bugtraq: https://bugtraq-apps.com

SELKS: https://www.stamus-networks.com/open-source/#selks

Backbox: https://backbox.org

Caine: https://www.caine-live.net

DEFT: https://www.deftlinux.net

Remnux: https://remnux.org

WebSecurityDojo: https://sourceforge.net/projects/websecuritydojo/

Slackware

Wifislax: https://www.wifislax.com

Gentoo

Pentoo*: https://www.pentoo.ch

BSD

IrBSD: https://pclite.net/page/irbsd

Fedora

NST: https://www.networksecuritytoolkit.org/nst

Arch

Arch Strike: https://archstrike.org

Black Arch: https://blackarch.org

TCL

TinyPAW: https://tinypawlinux.x10.bz

Anonymization

Debian/Xubuntu

Kodachi: https://www.digi77.com/linux-kodachi/

Whonix: https://www.whonix.org/

*: You have to learn a few things yourself to update your system (e.g. adding a signing key, setting the trust level, etc.). Anyway, this counts for any Linux system. Pentoo/Gentoo are recommended for experienced users only ;)

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Virtualization / Windows Emulator:

(e.g. virtual servers, test victims, games, etc.)

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Wine (Virtual Windows Environment/Windows Emulator): https://www.winehq.org/

       Applications like elster form and comparable are working flawlessly (tested at GNU-Linux-hardened (Grsec/SElinux))

       At the following page you can find a few free games for testing:

        - https://www.gog.com/games?page=1&sort=popularity&price=free

OpenVZ: https://openvz.org/

XEN: https://www.xen.org/

KVM: https://kvm.qumranet.com/

Virtualbox: https://www.virtualbox.org/

Bochs: https://bochs.sourceforge.net/

Linux-VServer: https://linux-vserver.org/

UML: https://user-mode-linux.sourceforge.net/

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Verschlüsselung:

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- LUKS 1/2 (Linux - Part of the Kernel since 2004, still the most solid/unbreakable solution for Linux to encrypt also a whole System with Twofish, Serpent, AES, etc. based upon up to 512 Bits or more [depending on your Patches/Kernel])

- PGP (Linux/Windows/Mac - Encryption and signing of files; most recommendable solution for E-Mail transfers - see PGP Tutorial: Windows / Linux)

- Veracrypt (Windows/Mac/Linux - Encryption with Twofish, Serpent, AES, etc. based upon at least 256 Bit)

- CryFS (Windows/Max/Linux - one of the best solutions for Online-Dropbox-Containers; Twofish, Mars, Poly, Serpent, AES, etc. - regardless of the block size, very large containers > 1TB could not be read out any more )

- 7Zip (Windows/Linux/Mac - Compression and Encryption of files, for example for E-Mails if there is no PGP available)

- TruPax (Windows/Mac/Linux)

- CipherShed (Windows/Mac/Linux)

- AES Crypt (Windows/Mac/Linux)

- DiskCryptor (Windows)

- AxCrypt (Windows)

Ragarding the encryption of entire discs / systems, it is and remains important to make backups, especially if this topic should still be new. Those can then be overwritten with zeros (e.g. in Linux /dev/zero) or better urandom (e.g. in Linux /dev/urandom) if everything works as expected. Incidentally, Android (Linux - ARM) cell phones also use LUKS for the encryption (Settings-> Security-> Encryption).

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Office Solutions:

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- Libre Office (GNU) https://libreoffice.org/

- Openoffice (Apache) https://www.openoffice.org/

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Email-Client Solutions:

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- Claws Mail https://www.claws-mail.org

- Geary https://wiki.gnome.org/Apps/Geary

- Thunderbird https://www.thunderbird.net

- Kmail https://www.kde.org/applications/internet/kmail/

- Sylpheed https://sylpheed.sraoss.jp/

- Zimbra https://www.zimbra.com/

- SeaMonkey https://www.seamonkey-project.org/

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Grafics / Animation:

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- GIMP https://www.gimp.org/

- INKSCAPE https://inkscape.org/

- DIA https://dia-installer.de/

- Scencil https://www.skencil.org/

- FontForge https://fontforge.org/

- Blender https://www.blender.org/

- Synfig Studio https://www.synfig.org/

- Pencil 2D https://www.pencil2d.org/

- OpenToonz https://opentoonz.github.io/e/

- Maefloresta Tupitube https://www.maefloresta.com/

- Krita https://krita.org

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Video Editors:

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- Kdenlive https://kdenlive.org/

- LiVES http://lives-video.com/

- OpenShot https://www.openshot.org/

- VidCutter https://github.com/ozmartian/vidcutter

- Shotcut https://shotcut.org/

- Flowblade https://jliljebl.github.io/flowblade/index.html

- Avidemux http://avidemux.sourceforge.net/

- Pitivi http://www.pitivi.org/

- Cinelerra http://cinelerra.org/

- NATRON https://natrongithub.github.io/

- GIMP https://www.gimp.org/

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Code-Editors:

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- VIM https://www.vim.org/

- NANO https://www.nano-editor.org

- Kate https://kate-editor.org/

- Kite https://www.kite.com

- Atom https://atom.io/

- Visual Studio Code https://code.visualstudio.com/

- NetBeans https://netbeans.org/

- Bluefish http://bluefish.openoffice.nl

- Geany https://www.geany.org/

- Komodo Edit https://www.activestate.com/products/komodo-edit/

- Emacs https://www.gnu.org/software/emacs/

- jEdit http://www.jedit.org/

- TextMate http://macromates.com/

- gedit https://wiki.gnome.org/Apps/Gedit

- Light Table http://lighttable.com/

- Blue Griffon http://bluegriffon.org/

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Audio Editing:

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- Audacity https://www.audacityteam.org/

- Ocenaudio https://www.ocenaudio.com/en/startpage

- Ashampoo Music Studio 2019 https://www.ashampoo.com/en/usd/dld/1530/music-studio-2019/

- Audiotool https://www.audiotool.com/

- Acoustica 6 https://acondigital.com/downloads/

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VNC-Server/Client Solutions to remote control PCs, arm devices, etc. like for example
TeamViewer(https://www.teamviewer.com/),etc.:

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- TightVNC https://www.tightvnc.com

- UltraVNC https://www.uvnc.com/

- RealVNC https://www.realvnc.com/de/

- TigerVNC https://tigervnc.org

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Desktop Environments:

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- KDE(X11 Linux) https://kde.org/

- GNOME(X11 Linux) https://www.gnome.org/