Open Source Software for Windows
Cypress.io
Cypress is an open-source front-end automated testing tool made specifically for developers and QA engineers. With Cypress.io, you can do fast, easy and reliable testing for anything that runs in the browser.
LibrePCB
LibrePCB is a free and open-source EDA (Electronic Design Automation) software used to develop printed circuit boards. The software is available cross-platform and can be used natively on macOS, Linux and Windows. LibrePCB ships with a advanced control panel, a simple yet powerful schematic editor and board editor, and a library manager that makes it super easy to extend the functionallity of the core.
NW.js
NW.js is a framwork for building desktop applications with HTML, CSS, and JavaScript. With NW.js you can call Node.js modules directly from DOM which enables you to write applications using technologies native to the browser.
JBoss Forge
JBoss Forge is a software development tool that extends your Java IDE, providing wizards and extensions for different technologies and solutions.
OpenXava
OpenXava provides software development tools that will make you work less. Much like JBoss Forge, OpenXava allows you to build business applications very fast. Simply write your domain logic and classes in plain Java, and instantally push your web application to production.
Lokl
With Lokl you can setup a local WordPress development environment for Mac, Win & Linux. Lokl is a free and open source and allows you to quickly spin up local WordPress environments from your command line tool.
Natron
Natron is a powerful Digital Compositor that can handle all of your 2D and 2.5D needs. Its robust OIIO file formats and OpenFX architecture is what make Natron the most flexible open source compositor for the visual effects community. Its interface and functionally are the same across all platforms such as MacOS, Linux and Windows. Natron has a powerful keying, roto/rotopaint, 2D tracking tools that are staple for all current film production project that requires visual effects.
JVM
The Java Virtual Machine or JVM for shot is an engine that provides runtime environment to run Java applications.
LLVM
LLVM is a compiler infrastructure project that contains a collection of modular and reusable compiler and toolchain technologies. LLVM stands for low level virtual machine yet the project has little to do with traditional virtual machines. LLVM is used to construct, optimize and produce intermediate and/or binary machine code. For example, programming languages like Crystal, Swift and Rust depend on the LLVM for compilation of code.
Chocolatey
With Chocolatey you can automate and simplify the management of complex Windows environments. Chocolatey is a free and open source package manager and software management tool specifically designed for Windows. People and organizations that use Chocolatey have experienced a massive reduction in effort, improved speed of deployment, while enjoying high reliability, and comprehensive reporting.