Free and Open Source Software
Yii Framework
Yii is a fast, secure, and efficient framework written in PHP. The framework is flexible yet pragmatic and works right out of the box with resanable defaults. With the Yii framework you can write more code in less time with simple with a powerful APIs and that include terminal commands for code generation for quick skaffolding. Yii is released as free and open source software under the liberal MIT License.
Turtl
Turtl is a note taking application that uses high-end cryptography to protect your data. Whether you're worried about information leaks, competitive advantage, or blanket government surveillance, Turtl works hard to make sure only you, and those you choose, can see your data.
Uppy
Uppy is a sleek, modular open source JavaScript file uploader. Uppy can fetch files locally and remotely from third-party services like Dropbox, Instagram and Google Drive. Uppy provides seamless integration with React, Vue.js, Svelte and other JavaScript frameworks.
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.
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.
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.
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.
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.