Open Source Software for Linux
Netcat
With Netcat you can read and write data across network connections with the TCP/IP protocol. Netcat is a feature rich networking utility for macOS, Linux and Windows that is designed to a reliable tool that can be utilized by external programs and scripts. Netcat provides intricate tools for netowork debugging, network exploration and connection creation.
Shotwell
Shotwell is a free and open-source image manager designed to orginize personal photos on Linux and the GNOME desktop environment.
Lutris
Lutris is a free and open-source, Linux-based operating system developed for gaming. With Lutris you can manage your game library, and install and launch games with no setup. Lutris is integrated with GOG, Steam, Battle.net, Origin, Uplay and many other games stores. The operating system is released under the GNU General Public License and is community built, anyone is free to contribute and use the platform.
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.
Flameshot
Flameshot is a free and open source screenshot software that is powerful and intuitive. It uses a DBus interface that allows you effectively take screen shots, and make in-app screenshot editions, and also upload images directly to third-party services like Imgur.
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.
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.
Snap Store
Snap Store is app store for Linux-based operating systems, used by millions of people across 41 distributions. At Snap Store you can easily find and install new applications or remove existing installed applications on your system. Snap Store provides free and open source software that can be bundled by anyone.
Shotcut
A free and openly developed video editing software that works cross-platform. Shotcut is developed on the MLT Multimedia Framework and is avalible for FreeBSD, Linux, macOS and Windows. Shotcut is released as open-source software under the GPLv3.