Open Source Software for Windows
Pidgin
Pidgin is a chat application which lets you log into accounts on multiple chat networks simultaneously. Pidgin is developed and released fully free and open-source and provides a plugin architecture that allow anyone to build extensions and connections to new networks and third-party services.
OpenSCAD
A free 3D CAD software developed for macOS, Linux and Windows. With OpenSCAD you can create solid 3D CAD objects through a script-only based modeller that uses its own description language. All objects in OpenSCAD can be viewed and inspected but not interactively selected or modified with gestures or mouse. Everything in OpenSCAD is based on scripts, a feature that some love. The software is openly developed and released under the GNU General Public License.
IPFS
The InterPlanetary File System or IPFS for short is a distributed hypermedia protocol designed to be the new permanent web. IPFS uses peer-to-peer to distribute the network across machines and the globe. IPFS combines decentralized technologies like Git, BitTorrent, Kademlia and SFS to build what they think could be the new internet, or a subsystem of it.
HeidiSQL
HeidiSQL is a free and open-source GUI for MariaDB, MySQL, Microsoft SQL, PostgreSQL and SQLite databases. With HeidiSQL, you can spectate and edit data and structure of your database in an intuitive interface. The software allows you to connect to your database via SSH tunnel or with SSL, and connect to multiple servers simultaneously, while also being able to monitor and kill client process in real-time.
Zulip
Zulip is an open-source real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones. Zulip provides modern apps for every major platform, powered by Electron and React Native. The software is 100% open source software, built by a vibrant community of hundreds of developers from all around the world.
WinUI
WinUI makes it easy to build modern, seamless UIs that feel natural to use on every Windows device. It embodies Fluent Design to enable intuitive, accessible, and powerful experiences and the latest user interface patterns. WinUI offers a state-of-the-art UI framework for all Windows apps across both Win32 and UWP. It provides a way to gradually migrate existing apps written in C++ and MFC (Microsoft Foundation Class Library).
DbGate
DbGate is a (no)SQL database client that supports MySQL, PostgreSQL, SQL Server and MongoDB. The software is free to use for any purpose and the source code is available under the MIT license. DbGate works on macOS, Linux, Windows and in your modern web browser.
Cigati PST Converter
Cigati PST Converter Tool is one of the most reliable software that can convert your files into different file formats and email clients. This utility causes no loss of data throughout the process of conversion of users' files. It keeps the data integrity as the original folder. Users can also rename the PST files before the process of conversion. Its GUI helps both technical and non-technical users to proceed with their work without hindrance.
Aptana Studio
With Aptana Studio you can build web applications quickly and easily using an industry leading web application IDE. Aptana utilize the power of the IDE Eclipes and levrages it into a powerful web development engine. Aptana Studio allows you to write HTML, CSS, JavaScript, PHP, and Ruby, with support for the latest HTML5 specifications. Includes information about the level of support for each element in the major web browsers.