Open Source Software for Windows
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.
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.
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.
balenaEtcher
With balenaEtcher people can create an installation media of your operating system by burning the image on a bootable flash drive. The software, that was previously known as Etcher, is developed by Balena and the open-source community and released free of charge under the Apache-2.0 License. balenaEtcher can be downloaded and used for following operating systems: macOS, Linux and Windows.
Inkscape
A free and open-source vector graphics editor developed by macOS, Linux and Windows. Inkscape provides a rich set of features and is widely used for both artistic and technical illustrations such as cartoons, clip art, logos, typography, diagramming and flowcharting. With Inkscape you can work on Scalable Vector Graphics (SVG) with a modern and intuitive UI and UX loved by many in the open-source community.
Arduino IDE
Audrion IDE is a code editor and integrated development environment for Audrio boards used by makers across the globe. The open-source Arduino IDE makes it easy to write code and upload it to any Arduino board. Audrion IDE provides an interface that features autocompletion, code navigation, and even a live debugger.
Kitty Terminal
Kitty is a fast, featureful, GPU based terminal emulator for macOS, Linux and Windows. The project is developed by kovidgoyal and released as free and open software under the GPL-3.0 License. The terminal achives maximal performance by offloading rendering to the GPU for lower system load and smooth scrolling, making it a good choice when compared to resource heavy elctron-based terminals. Kitty Terminal also supports modern features like graphics, unicode, true-color, OpenType ligatures, mouse protocol, hyperlinks, focus tracking, bracketed paste and several new terminal protocol extensions.
Twine
Twine is an open source tool for telling interactive stories. With Twine, it simple to create interactive fiction that can be displayed as web pages. Each projects starts with a blank pages that binds itself and it can bind itself along an infinite number of spines extending in any direction. Twine runs nativley on macOS, Linux and Windows machines and on the web.
PhantomJS
PhantomJS is a headless web browser scriptable with JavaScript. PhantomJS utilize QtWebKit as the backend to offer fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. PhantomJS is most commonly used by developers to run browser-based unit tests in a headless system like a continuous integration environment.
Apache OpenOffice
Apache OpenOffice is a free and open-source office suite that offers free applications for word processing, spreadsheet, presentations, graphics, and databases. It is one of the successor projects of OpenOffice.org and the designated successor of IBM Lotus Symphony. With Apache OpenOffice all data is stored in an open standard format allowing users to read and write files from all major office software.