Free 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.
Wireshark
Wireshark is the world's most widely-used network protocol analyzer software. With Wireshark you can get a better understanding on what's happening on your network. The software let's you do deep analysis across hundreds of protocols at a microscopic level. Wireshark is free and open-source and has been in active development by contributions from volunteers across the globe since 1998. Today the software is used by commercial and non-profit enterprises, government agencies, and educational institutions.
MultiBootUSB
MultiBootUSB is a cross platform software that allows you to install multiple live linux on a USB disk non destructively and option to uninstall distros. MultiBootUSB is written in Python and is released as free and open-source software under the GPL-2.0 License.
Pencil2D
Pencil2D is a simple, yet powerful 2D animation, drawing and painting application that lets you create traditional hand-drawn animation using both bitmap and vector graphics. Pencil2D is released as free and open-source software under the GNU General Public License and uses the Qt framework. With Pencil2D you can seamlessly switch between raster and vector workflows, allowing you to sketch, ink & paint on the go.
Clementine
Clementine is free and open-source music player and library organizer based on Amarok 1.4. The application work cross-platform and is avalible for BSD, macOS, Linux, and Windows.
Double Commander
Double Commander is a cross-platform open source file manager with two panels side by side. The application takes inspiration from Total Commander and brings new features and ideas to file management. With Total Commander all archives are handled like sub directories and you can easily copy files to and from archives. Supported archive types include ZIP, TAR, GZ, BZ2, XZ, LZMA, 7Z, RPM, CPIO, DEB, RAR and ZIPX.
KDE Plasma
KDE Plasma is a free and open-source graphical workspaces environment built Linux systems. You can use KDE Plasma to suf the web, keep in touch with colleagues, friends and family, manage your files, enjoy music and videos, and get creative and productive at work. KDE Plasma is built using Qt and KDE Frameworks and supports HiDPI displays and ships a highly convergable graphical shell.
RSSOwl
RSSOwl is a powerful RSS application that can help you organize, search and read all your news feeds in a comfortable way. RSS Owl is released as open-source software and can be downloaded and used for free, without limitations. With RSS Owl it's easy to stay on-top of the latest news and information that you like. All feeds can be categorized with labels and articles can be saved individually, and when new content in your feed is released RSS Owl automatically notify you through its notification system. RSS Owl is developed as a cross-platform software and runs on all major platforms including macOS, Linux, and Windows.
SoftMaker FreeOffice
SoftMaker FreeOffice is free and highly intuitive document creation software for business and personal use. SoftMaker FreeOffice is compatible with Microsoft documents such as as DOCX, XLSX, and PPTX allowing you to migrate from and work interchangably with the Microsoft line of office products. The FreeOffice suite includes a word processor, a spreadsheet application and a presentation application.
Jenkins
Jenkins is a free and open source DevOps tool used for ticket systems and CI/CD infrastructure. Jenkins provides hundreds of plugins to support building, deploying and automating any software project. The tool is a self-contained Java-based program that is ready to run out-of-the-box, with packages for Windows, Mac OS X and Unix-like operating systems. Anyone is free to contribute to Jenkins, and the software is released under the MIT license.