Free and Open Source Software
Padrino
Padrino is a Ruby web framework built upon the library Sinatra. Sinatra is a DSL designed to create simple and performant applications written in Ruby. Padrino is uses Sinatra at its core and builds upon it to create a framework take makes it even easier and faster to create advanced web applications with Ruby. Padrino is designed to be agnostic and provides full support for many popular testing, templating, mocking, and data storage choices. It also provides generators that makes it easy to create, models, controllers and application scaffolding. On top of that Padrino provides functionality found in most frameworks including solutions for assets, forms, mail, caching, administration and logging.
ZeroNet
ZeroNet is a decentralized web-like network of peer-to-peer users. It's basically BitTorrent thrown at the problem of web hosting and networking. With ZeroNet you can create open, free and uncensorable websites using cryptograic features of Bitcoin. ZeroNet uses .bit domain names and a decentralized domain regestry using Namecoin.
XWiki
Developed for more than 10 years, XWiki is a long standing project trusted by individuals and high profile corporations. XWiki is a free and open source Wiki software written in Java and released under the GNU Lesser General Public License. XWiki provides a WYSIWYG editing, OpenDocument based document import/export, semantic annotations and tagging, and advanced permissions management fit for enterprise use. The extensible XWiki platform allow you to customaize and improve your Wiki as the content, userbase or usecase grows and evolves.
Seed.rs
Seed is a frontend Rust framework for creating fast and reliable web apps with an elm-like architecture. Seed provides all the benefits of Rust and macro based syntax, with a minimal overhead, configuration, and boilerplate. The framework is easy to pickup thanks to the clear documentation which is accessible to developers whether they are familiarity with Rust, or not.
LMMS
LMMS is a free and open-source digital audio workstation available for Linux, macOS and Windows. The software was first release as Linux MultiMedia Studio back in 2004. Since then LMMS has evolved to support more platforms include macOS and Windows. LMMS can be used to compose, mix and sequence music in a simple and intuetive interface while also providing MIDI or keyboard support.
AppCenter
AppCenter is the software store that comes bundled with every release of elementary OS. The store allows users of elementary OS to download curated software specifically built for the operating system. The AppCenter operates under a Pay-What-You-Want pricing model which allow developers to earn money from their open-source creations. Anyone is free to create apps for elementary OS as long as they follow the design guide lines provided by the elementary project.
Audius Music
Audius is a music streaming and sharing platform that puts power back into the hands of content creators.
Waterfox
A free and open-source web browser developed specifically for x64, ARM64, and PPC64LE systems. Waterfox is fully customizable and allows users to modify and extend the browser any way the please with WebExtensions and classic-style bootstrap add-ons. The browser also respects your privacy, with no built-in telemetry or data collections (beside version number, for automatic updates). Waterfox is available for all major computer operating systems like macOS, Linux and Windows, and a mobile version for Android.
Unreal Engine
The Unreal Engine is a game engine and suite of tools and technologies developed by Epic Games. The engine was first released in 1998 as a part of the first-person shooter game Unreal, where the game itself was built on the engine. Today the Unreal Engine has grown into an ecosystem that includes a marketplace for game assets that can help indie developer to develop games and make a living selling game assets them selves. The Unreal Engine is free to use and provides a revenue-share model for developers and has been used to tipple A studios and indie developers to create games in almost every genre, including platformers, fighting games,RPGs, MMORPGs, and many more.
Android
Android is a free and open source mobile operating system built on-top of the Linux kernel. The OS is used by over 150 million people world-wide, which makes it the most popular mobile operating system on earth. Android is optimized for how you use your phone, helping you manage conversations, organize your day, and connect with the people that matters most to you.