Open Source Software for Windows
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.
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.
Padlock
Padlock is an open source, cross-platform password manager that lets you syncronize passwords across platforms. With Padlock you can store your passwords saftley. Padlock is provided as a manage service for a monthly cost, or can be self-hosted on your own hardware or in the cloud.
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.
Buttercup
Buttercup is a free and open-source password manager, available on all major platforms. With Buttercup you can track and store your login information for any service and device that you use. The application's securely encrypted vault allow you to store account information securely with additional support for 2FA/OTP (TOTP).
Rancher
Rancher enables organizations to easily run containers in production. It is a complete free and open-source software stack for teams adopting containers. With Rancher, you no longer have to build a container services platform from scratch by combining various open source technologies. Rancher addresses the operational and security challenges of managing multiple Kubernetes clusters, while providing DevOps teams with integrated tools for running containerized workloads.
OpenSSH
OpenSSH is a free and open-source suite of secure networking utilities. The suite provides tools for remote login with the SSH protocol. All traffic over OpenSSH is fully encrypted eliminate eavesdropping, connection hijacking, and other malicious activities by potential attackers.
Pygame
Pygame is a library that includes a set of modules designed for writing video games in Python. Pygames wraps and adds functionallity on top of the C library SDL. A cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. Allowing you to create fully featured games written entierly in the programming language Python.
Vagrant
Vagrant is an open-source software building portable and virtual development environments. With Vagrant, developers and devops can create development environments that mirror production environment by providing the same operating system, packages, users, and configurations. Vagrant can be spin up environments for VirtualBox, KVM, Hyper-V, Docker containers, VMware, and AWS, and integrates with exiting configuration tooling such as Ansible, Chef, Docker, Puppet or Salt
Godot Engine
Godot is a free and open-source 2D and 3D, cross-platform, game engine released under the MIT license. With Godot, you can develop games using Go or GDScript. Godot provides a huge set of common tools for game production, so that you can focus on making your game without reinventing the wheel. The development environment runs on multiple operating systems including Linux, macOS, and Windows and can compile games for PC, Mobile and the web browser.