Free Software for macOS
XAMPP
XAMPP is a free and open-source Apache web server stack used in web development. The XAMPP stack contains pre-configured versions of Apache HTTP Server, MariaDB, PHP, and Perl. XAMPP makes it really easy to install and use the stack on macOS, Linux or Windows.
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.
Light Table
Light Table is an IDE (integrated development environment) for software development. The application is built by Chris Granger and Robert Attorri and features real-time feedback allowing instant execution, debugging and access to documentation.
Mapserver
MapServer is an free and open-source platform for publishing spatial data and interactive mapping applications to the web. Originally developed in the mid-1990’s at the University of Minnesota, MapServer is openly developed and released under an MIT-style license, and runs cross-platform on macOS, Linux and Windows. MapServer is not a full-featured GIS system, nor does it aspire to be.
Ungit
Let's face it, Git is not allways easy to use through the command line, especially if you are working across projects and branches. Ungit was created to solve this problem. Ungit is a free and open-source plaform for managing Git visually. Ungit is self-hosted and runs on any platform that supports Node.js and Git. The software also works well with Git platforms such as GitHub and GitLab.
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.
Flutter
Flutter is an open-source UI software development kit created by Google. Flutter allows developers to write Android and iOS application in Dart. Flutter can be installed on any desktop computer and server that runs Linux, macOS or Windows. The SDK provide developers with a great developer experience with hot reload, that allows for quick iterations and a quick development workflow when building UI's, adding features and fixing bugs.
VSCodium
VSCodium is a community-driven, freely-licensed binary distribution of Microsoft’s editor VSCode. VSCodium is built on the same source code as VSCode, but with telemetry and tracking removed before it is packaged as an application. VSCodium is released under the MIT license and is a great way to use VSCode without being tracked by Microsoft.
Traverso DAW
Traverso DAW is a digital audio workstation that is designed to be an extension of your creativity and workflow. With Traverso DAW, you can compose, record and edit your audio with an unprecedented speed and ease. Traverso DAW is released as free and open-source software under the licensed under GNU General Public License.
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".