MPV (stylised mpv) is a free software command line media player
https://mpv.io/

Software is like sex: it's better when it's free.
- Linus Torvalds

Evince is a free software PDF document viewer. It also opens other free document formats.
https://wiki.gnome.org/Apps/Evince

KeePassX is a free software password manager. It saves usernames and passwords, has a password generator, and is always encrypted.
https://www.keepassx.org/

Notepad++ is a free software Notepad replacement and Source code editor.
https://notepad-plus-plus.org/

Free software' is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech,' not as in 'free beer'.
- Richard Matthew Stallman

Audacity is a free software Audio Editor and Recorder for all popular operating systems.
www.audacityteam.org

Parabola is a fully free lightweight operating system.
https://www.parabola.nu/

Arguing that you don't care about the right to privacy because you have nothing to hide is no different than saying you don't care about free speech because you have nothing to say. Nobody needs to justify why they 'need' a right. The burden of justification falls on the one seeking to infringe upon the right. You can't give away the rights of others because they're not useful to you. More simply, the majority cannot vote away the natural rights of the minority.
- Edward Joseph Snowden

HTTPS Everywhere is a Firefox, Firefox for Android, Chrome, and Opera extension that encrypts your communications with many major websites, making your browsing more secure. 
https://www.eff.org/https-everywhere%20

0 A.D is a free Ancient Warfare real-time strategy game set in the years between 500 B.C and A.D 500 for GNU/Linux,Windows and OSX.
https://play0ad.com/

7zip is a free program for packing and unpacking compressed files. It supports major formats as well as its own high compression zatio 7z format.
www.7-zip.org/

qBittorent is a free software P2P bittorrent client
http://www.qbittorrent.org/

HandBrake is a free software video transcoder, to make ripping a film from a DVD to a data storage device easier.
https://handbrake.fr/

Avidemux is a free, simple video editor.

FreeCAD is a free parametric 3D CAD modeler.

Stellarium is a free software planetarium for your computer. View over 600,000 stars with contellations planets and their moons realistically.

DVD Flick is a free and open source DVD authoring application capable of importing audio tracks, video files and subnoscripts, composing a DVD-Video movie with menus and burning it to a disc.

Thunderbird is a free software email client that can manage multiple email, newsgroup, and news feed accounts.