Open Source Software
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.
Minds
Minds is an alternative, blockchain-based social media platform. With Minds you can earn money or cryptocurrency for using the platform and interactive with other people. Tokens can be used to boost posts or crowdfund other users and their cause. Minds was to be a privacy-focused social network that is censorship resistant, and where users can interact without having their personal data harvested.
K-9 Mail
K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email. K-9 Mail is designed for both novice and power users and offers lots of features for everyone. It provides features like Push IMAP Support, GPG & PGP/MIME support, Per Account Notifications, Unified Inbox, White and Dark Theme, and Signatures.
Sails.js
Sails.js is a JavaScript framework that makes it easy to build custom, enterprise-grade Node.js apps. It is designed to resemble the MVC architecture from frameworks like Ruby on Rails, but with support for the more modern, data-oriented style of web app development. The framework is suited for building applications with realtime features.
Wekan
Wekan is a free and open soure, web-based, kanban tool that can be self-hosted. With Wekan you can maintain personal todo lists, keep an itinerary for you next trip with your friends or collaborate with your team on large scale projects. The Kanban experience provided by Wekan makes it super easy to get a broad overview of your project and how you and your team can move it forward.
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.
Scrapy
Scrapy is a fast and powerful web scraping library written in Python. The framework makes it easy to crawl and extract structured data from the web services. Scrapy can be used for a wide range of purposes, ranging from data mining to service monitoring. Scrapy is maintained by Zyte and is released as free and open source software.