Free Software for Linux
SQuirreL SQL
SQuirreL SQL is a free and open-source SQL client and database administration tool. SQuirreL SQL is written in Java and uses JDBC to allow users to explore and interact with databases via a JDBC driver. With SQuirreL SQL you can manage your database through a graphical user interface where you can create and drop tables, add columns and rows, create function and query your data. The software is openly developed and released under the GNU Lesser General Public License which makes it free to use.
EiffelStudio
EiffelStudio is an Integrated Development Environment that enable you to produce correct, reliable, maintainable software and control the development process. The IDE is specifically designed for the Eiffel programming lanaguge and comes with a debugger and browsable editor that makes it easy to navigate parts of your system and track down bugs, and quickly fix them.
Signal
Signal is a cross-platform encrypted messaging application that has a strong focus on privacy. The application is developed by Signal Messenger LLC and provides users with features like one-to-one and group messages, which can include files, voice notes, images and videos. The software is famous for being used by the whistleblower and privacy advocate Edward Snowden who once said "I use Signal every day, it is the most scalable encryption tool we have".
Pinta
Pinta is a free and open source drawing and image editing software similar paint.net. Pinta provides a simple yet powerful user interface that enables it users to draw and manipulate images on Linux, Mac, Windows, and BSD.
VirtualBox
VirtualBox is a free and open-source hosted hypervisor for x86 virtualization, developed by Oracle. The software is used to create virtual machines that can be used for testing, and building software in virtually contained environments. VirtualBox is available for on macOS, Linux. Windows, Solaris and OpenSolaris.
Conky
Conky is a system monitor that will display pertinent information on your desktop. When you peel past the top layer, you will see Conky is actually much more than that. The systems widget can neatly display information about your CPU, memory, swap files, harddrive space, computer temperature, upload and download speed.
Gitea
Gitea is a free and open-source software package for hosting software development version control using Git The software is written in Go and is a community managed fork of Gogs, released under the MIT license. With Gitea you can host your very own software project collaboration platform that can handle bug tracking, wikis, code review and team communication.
UNetbootin
UNetbootin, short for Universal Netboot Installe is a tool that allows you to easily create bootable USB flash drives to install or try operating systems. This software is designed to be cross-platform and works with Windows, as well as Mac and Linux operating systems.
KDE Connect
KDE Connect is an open source software that enables communication between all your devices. With KDE Connect, you can get all your phone notifications instantly synced to your desktop, so that you never miss that critical message. You can also directly reply to text messages from the computer without having to pick up your mobile device. If you want to share files or links between devices, KDE Connect got you covered as well. As the software allow you to browse and share your phone files remotely or quickly open a link on the other device.
Plasma System Monitor
Plasma System Monitor is a new system monitoring app for KDE Plasma desktop. The software gives KDE users a concise, accurate overview of current system activities and resource usage. With Plasma System Monitor, users can now build their own custom dashboard that shows the stats, sensors, and data they want to see, and control the way the data is presented.