Free Software for Linux
GitKraken
Unleash the power of Git with GitKraken, the free Git GUI for Windows, Mac & Linux. With GitKraken you can easily work with repositories hosted on any of these sites. Clone, add remotes, and create/open pull requests without ever leaving the application. GitKraken is an open-source project released as two versions, GitKraken Free and GitKraken Pro. The free version works with major platforms like GitHub, GitLab, Bitbucket while providing extra features in the pro version to work with GitHub Enterprise, GitLab Self-Managed, Bitbucket Server, and Azure DevOps (VSTS).
Simplenote
Simplenote is a cloud-based note-taking application with markdown support. Simplenote works cross-platform and all notes are synced can be accessed from any device that has the application installed, Simplenote also work in most modern browsers.
Beekeeper Studio
Beekeeper Studio is a well-designed and easy to use SQL client for MySQL, PostgreSQL, SQLite, SQL Server, and a variety of other relational database management systems. The software allows you to connect to databases normally or encrypted with SSL, or tunnel through SSH to ensure maximum security while still providing choices. With Beekeeper Studio, you can manage multiple tabs and multitask across operations, while providing auto-complete suggestions for tables and queries. Commonly used queries can be saved and orginized into workspaces, that can be used across connections and projects. Beekeeper Studio is both free and open source and released under the MIT License.
Standard Notes
Standard Notes is a safe place for your notes, thoughts, and life's work. With Standard Notes you can create, edit and manage notes with a complete encrypted app that is free and open source.
gThumb
gThumb is a free and open-source image viewer and Image organizer for the GNOME Desktop. The software can be used to view, orginize and edit BMP, GIF, ICO, JPEG, PNG, TIFF, XPM files. An importer tool is also include, it can be used for transferring photos from cameras. With the editing tool, photos can be rotated, flipped and cropped, or optimized for the right contrast ratio. gThumb is developed by the The GNOME Project and released under the GNU General Public License.
DB Browser for SQLite
A high quality, visual, open source database management tool for SQLite databases. With DB Browser for SQLite, users and developers can create, search, and edit databases. DB Browser for SQLite uses a familiar spreadsheet-like interface, and complicated SQL commands do not have to be learned.
Janet
Janet is a functional and imperative programming language that runs on Windows, Linux, macOS, and BSDs. Janet makes for a good system scripting language, or a language that can be embed in other programs. The entire language (core library, interpreter, compiler, assembler, PEG) is less than 1MB.
PhotoQt
PhotoQt is a free and open-source, simple yet powerful image viewer, based on Qt/QML. It mprovides provides a simple and uncluttered interface filled powerful features. PhotoQt supports GraphicsMagick, Libraw, FreeImage, DevIL, Poppler, libarchive.
Peppermint OS
Peppermint OS is Ubuntu-based Linux distribution that uses LXDE desktop environment. It aims to provide a familiar environment for newcomers to Linux. Peppermint OS requires relatively low hardware resources to run, which makes it a perfect choice for older or lower specced hardware. The operating system follows the Ubuntu release cyckle and provides support for LTS releases.
QtPass
QtPass is free and open-source, cross-platform password manager that is part of the pass ecosystem. The pass project is an open initiative that builds the standard unix password manager, a universal protocol for password management. This means that you can easily switch away from the QtPass to a new client, as long as it uses the "pass" password store.