Open Source Software for Linux
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.
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.
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.
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.
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.
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.
Caddy
Caddy is a powerful, enterprise-ready, open-source web server written in Go. The Caddy provides automatic SSL/TLS cretificates so that your application always is served over HTTPS.
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.
Cryptomator
Cryptomator is a simple tool makes your cloud storage trustworthy. With Cryptomator, you can encrypt your data quickly and save it to your favorite cloud services provider. The tool is released as free and open source software under the MIT License. Allowing you and other developers to verify and build upon the source code, to further strengthen and improve the application.
Akira UX
Akira UX is a free an open-source graphic design software built with Vala and GTK. The application offers a fast approach to UI and UX Design, mainly targeting web designers and graphic designers. Akira UX is available for all major Linux distributions, and through the elementary OS AppCenter.