OpenRA is an open source project that recreates and modernizes classic real time strategy games such as Red Alert, Command & Conquer and Dune 2000. Playtest builds add single-player content, multiplayer and skirmish balance changes, AI improvements and engine updates.
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opensourcealternative.to is a free directory that bills itself as the world's largest collection of open source software alternatives to proprietary products. It hosts over 500 open source alternatives to popular proprietary tools, and reports that over 2 million users have replaced proprietary software with options found on the platform. Listed alternatives include game engines, business suites, observability platforms, communication tools, and databases.
The Open Source Games List (OSGL) is a site for browsing technical information about open source games and related engines, frameworks and tools. Content is based on descriptions stored on GitHub, and supported platforms include Windows, Linux, macOS, Android, iOS and web. The site states it is a best-effort result likely to contain inaccurate information.
OverTheWire is a community offering wargames intended to help people learn and practice security concepts through games. Its suggested order begins with Bandit for Unix/Linux basics, followed by a choice among Natas for web security, Krypton for cryptography or Leviathan for reverse engineering, then binary exploitation games. Each shell game uses its own SSH port.
Pixel Gun Mayhem is a Pixel Gun 3D fangame built on version 12.0 as a base and targeting the style, charm and content of version 18.0. It ports or reverse engineers features such as UI, minigames, gamemodes, weapon gimmicks and maps, and adds new content, reworked balancing and a reworked progression system. The project states it is not affiliated with, supported by, sponsored or approved by CUBIC GAMES.
Ren'Py is a visual novel engine for telling interactive stories with words, images and sounds on computers and mobile devices. It covers visual novels and life simulation games, using an easy to learn script language and Python scripting. It is open source and free for commercial use, with supported platforms including Windows, Mac, Linux, Android and iOS.
Rochester Institute of Technology is a university offering bachelor's, master's and doctoral degree programs across areas including art and design, business, computing, engineering, game design, health professions, liberal arts, photography and science. Its homepage describes technology, the arts and design and lists cooperative education and internship programs among its offerings.
Source 2 Viewer (S2V) is a free, open-source tool for browsing VPK archives and viewing, extracting and decompiling Source 2 assets, including maps, models, materials, textures, sounds and particles. The project is reverse-engineered without an official Source 2 SDK and is not affiliated with Valve Software. It supports games such as Counter-Strike 2, Dota 2, Deadlock and Half-Life: Alyx.
Scid vs. PC is a chess toolkit derived from Shane's Chess Information Database that lets users create large databases, run chess engines, and play casual games against the computer or on the Free Internet Chess Server. It began as bug fixes for Scid's computer-versus-player features and has grown into a broader alternative with new interfaces.
UEVR is a frontend tool for injecting into Unreal Engine games to add stereoscopic 3D rendering and full 6DOF head tracking. It supports the OpenVR and OpenXR runtimes, lists tested headsets including Oculus, Valve Index, HTC Vive and various Pimax and WMR models, and offers Native Stereo, Synchronized Sequential and AFR rendering methods.
VulkanGuide is a work-in-progress guide to the Vulkan graphics API that focuses on dynamic rendering as a base for game engine code. It uses C++20 and Vulkan 1.3, covers initialization, compute shaders, mesh drawing, textures and GLTF scene loading, and targets readers who already know 3D graphics basics. An older version covers Vulkan 1.1.