Windows

Web Browsers

• Mozilla Firefox (recommended) free (MPL, GPL, LGPL)
• Google Chrome gratis

Browser Addons

• uBlock Origin Firefox/Chrome Adblocker free (GPL)
• EFF Privacy Badger Tracker-blocker free (GPL)
• Firefox Multi-Account Containers free (MPL)

Office Suites

• Libre Office (recommended) free (MPL, GPL, LGPL)
• Microsoft Office payed

E-Mail Clients

• Thunderbird (recommended) free (MPL, GPL, LGPL)
• Outlook payed

E-Mail Encryption

• GPG4Win (OpenPGP implementation) free (GPL)
• Enigmail (for Thunderbird, requires GPG4Win) free (MPL)

Archivers

• 7zip (recommended) free (LGPL)
• WinRAR gratis

PDF Viewers

• SumatraPDF (recommended) free (GPL)
• Adobe Acrobat Reader gratis

Ebook Manager

• Calibre free (GPL)

Ebook DRM Remover

• DeDRM gratis (open source)

Disclaimer: Removing DRM is illegal in some countries (e.g. US or Germany).

Image Editors

• Adobe Photoshop payed
• Krita (recommended) free (GPL)
• GIMP free (GPL)

Text Editors

• Notepad++ (recommended) free (GPL)
• GVim (only for power users) free (Vim license)
• Atom (resource heavy) free (MIT)

Mathematics

• GeoGebra Classic 6 gratis

Gaming

• Steam gratis*
• Discord gratis

Java

• Java SE 10 JRE gratis
• Java SE 8 JRE gratis

What is the difference between free and gratis?

Free means free as in freedom while gratis only means that you don’t have to pay for it.

*games on Steam can cost something