Open Source Gaming & eSports Software
GDevelop
GDevelop is a 2D cross-platform, free and open-source game engine that takes visual programming to the next level. GDevelop allows you to take read-made behaviours and add them to your game objects or create new once with intuitive and east to use events. With GDevelop, it is easy to make games for PC and Mobile, as well as launch HTML5 games playable right in your web browser.
Opera GX
Opera GX is a free gaming-centric web browser developed by Opera Software AS. The browser provides native integration to Discord and other chat applications and day and night mode built right into the browser itself. Opera GX was first announced at E3 2019 and is still in early access.
PlayKey
PlayKey is a decentralized cloud gaming platform. PlayKey is the first of is kind, and makes decentralized cloud gaming profitable for everyone.
Phaser
Phaser is a fast, free, and fun open source HTML5 game development framework. It uses a custom build of Pixi.js for WebGL and Canvas rendering, and supports desktop and mobile web browsers. Games developed with Phaser can be compiled to iOS, Android and native desktop apps via third party tools. With Phaser you can developed games written in JavaScript or TypeScript.
Torque 3D
Torque 3D is a premier open-source game engine. Torque 3D includes both a high-performance forward-rendering basic lighting engine, and a deferred-rendering advanced lighting mode. A plugin system for physics, and networking capabilities with a server authoritative networking model, used for multiplayer games. The game engine has been used to create everything from driving simulators to MMOs to first-person shooters.
GameHub
GameHub is a games library manager that allows you to view, download, install, run and uninstall games from Steam, GOG, Humble Bundle, Humble Trove and more. It supports non-native games and native Linux games alike. GameHub also supports multiple compatibility layers for non-native games including Wine / Proton, DOSBox, RetroArch, ScummVM. While at the same time allowing you to add custom emulators.
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.
Playnite
Playnite is an open source video game library manager that provides a unified interface for all of your games.
RetroArch
With RetroArch you can run emulators, game engines, video games, media players and other applications. RetroArch is a free and open-source frontend developed specifically for emulation. RetroArch allows you to play classic games on a wide range of computers and consoles through its slick graphical interface. The project is community developed and the software is released under the GNU General Public License v3.
Amazon Lumberyard
Amazon Lumberyard is a free, cross-platform game engine based on the famous CryEngine. With Amazon Lumberyard, you can create games without royalties, seat fees and additional costs. Since the game engine is developed by Amazon it provides some interesting integrations out-of-the-box. Lumberyard provides frictionless integration with Twitch and AWS for hosting and displaying and promoting your new game.