Free Software for Linux
PureOS
PureOS is a fully audit-able operating system developed and maintained by the privacy-focused Linux device manufacturer Purism. With PureOS you can rest assured that your privacy is taken seriously. The operating system has been independently verifiable by security experts and software developers around the world and is developed and released as a free and open source operating system. Under the hood, PureOS uses the popular GNOME desktop environment which is loved by many in the Linux community for its polish and long standing project commitment.
RedisGraph
RedisGraph is the first free and open source queryable Property Graph database to use sparse matrices to represent the adjacency matrix in graphs and linear algebra to query the graph.
USBImager
A really simple open-source, GUI application that writes compressed disk images to USB drives and creates backups. USBImager is avalible for Linux, macOS, and Windows.
Ultimaker Cura
Ultimaker Cura is a free 3D printing software that is used by millions of users worldwide. The software is an advanced slicing engine that can be used to prepare your 3D models in a few clicks, and then easily send of to the printer, and get job done.
FlexGet
FlexGet is a free and open-source multipurpose automation tool for all of your media with support for torrents, nzbs, podcasts, comics, TV, movies, RSS, HTML, CSV, and more.
Thunderbird
A free an open-source email client developed openly by the Mozilla Foundation and the community. Thunderbird is easy to setup and customize and supports POP and IMAP. The email client comes with all features needed to search, filter, write and manage emails, but also have builtin support for live chat between contact and RSS/Atom feed reader.
Node.js
Node.js is a free and open-source JavaScript runtime environment built on the V8 engine. Node.js can execute JavaScript outside of a web browse and works cross-platform. The platform is used to power many JavaScript software project and web application in production today. Node.js is perfect for data-intensive real-time applications due to its event-driven and non-block I/O model.
Irssi
Irssi is a terminal based IRC client for UNIX-based operating systems. Irssi comes with IRC built-in and is multi-protocol friendly for module authors, it also support integration with SILC and ICB protocols via plugins. The application easily integrates with your window manager, your terminal emulator, your remote connection, your terminal multiplexer, your IRC bouncer and your IRC adapter. Allowing you to use Irssi virtually everywher throughout your system. Irssi is free software licensed under the GPLv2, available for macOS, Linux, BSD, Solaris, and Cygwin.
Tor
Tor is free and open-source software and network that enables anonymous communication and browsing. Tor can be used to defend yourself from aggressive tracking, surveillance and censorship and provides a good base for anonymity online. The name Tor is derived from the original project name "The Onion Router".
LibreOffice Calc
LibreOffice Calc is a free and open-source spreadsheet tool part of the LibreOffice software package. With LibreOffice Calc users can manage spreadshets with its native Open Document Format (.ods), CSV (.csv) and other common formats like the Microsoft Excel format. The software is openly developed by The Document Foundation and the open source community while being released under a combination of license including MPLv2.0 and a secondary license GPL, LGPLv3+ or Apache License 2.0.