Open-source alternatives to HMCL

MultiMC5 is a Minecraft game launcher and instance manager designed to start and manage multiple independent installations of the game on a single computer. It functions as a centralized multi-installation game manager that handles various game configurations and settings from a single interface. The system enables the organization of separate game environments to run different versions and modpacks without software interference. This is achieved through a management interface that supports switching between different releases while keeping game files, settings, and modifications isolated. T

HMCL is a JVM-based cross-platform utility and Minecraft game launcher designed to install, manage, and launch multiple versions of Minecraft. It functions as an instance manager for organizing separate game profiles with unique settings and assets, as well as a mod loader manager for automating the installation of modification frameworks and community-created content. The project features a modular UI framework with a pluggable layout system, decoupling the visual interface from the core logic to allow for appearance and arrangement customizations. It automates the integration of modificatio

Legendary is a game management tool designed for downloading, installing, and updating game files from remote servers without the use of official store clients. It provides a means to list available account titles, track installed games, and import existing local installations by verifying files. The project enables the management of Steam game libraries on systems where the official client is unsupported and supports the activation of titles from third-party accounts through external authorization systems. It also provides tools for configuring Linux gaming environments, specifically through

Lutris is an open source game launcher and library manager that provides a unified dashboard for organizing and executing video games. It functions as a game installation automator and a wrapper for compatibility layers, allowing software designed for different platforms to run on Linux and macOS. The project distinguishes itself through a runner-based execution model that manages specific software environments and emulators. It utilizes community-driven scripts to automate the downloading and setup process for games and synchronizes libraries across multiple digital storefronts and third-par

Unciv is an open-source, cross-platform turn-based strategy game and a community-driven remake of a commercial strategy title. It simulates empire building, city management, and technological research for players on Android and desktop platforms. The project is designed as a moddable game engine, allowing users to override gameplay rules, modify units and buildings via external definition files, and replace audiovisual assets. It supports the distribution of custom maps and the ability to import mod archives from remote web addresses. The application includes a dedicated server for multiplay

OpenTTD is an open-source game engine and transport simulation game. It provides an isometric sandbox environment for building and managing complex logistics and transport networks. The project functions as a multiplayer simulation sandbox where users can build infrastructure cooperatively or competitively in a shared virtual world. The platform is designed as a moddable simulation system that supports external assets, graphics, and gameplay modifications. It includes mechanisms for downloading and integrating add-on content and utilizes a plugin-based system to extend game mechanics beyond t

Prism Launcher is a Minecraft game launcher and instance manager designed to authenticate game accounts and start installations via a graphical interface or command line. It functions as a modpack installer that automates the setup of preconfigured modification sets from various third-party platforms. The project focuses on maintaining multiple independent game installations on a single machine, using isolated environments to ensure that different versions, mods, and save files do not conflict. It includes a Java runtime configurator to detect and assign specific system environments for compa

Steamtinkerlaunch is a game launch wrapper and Wine prefix orchestrator designed to manage the execution environment of games on Linux. It functions as a compatibility layer manager that downloads and organizes custom Wine and Proton versions, while creating isolated filesystem hierarchies and registry hives to prevent configuration conflicts between games. The project specializes in automating the installation of mod managers and script extenders within these isolated environments. It acts as a post-processing shader injector, managing the installation and dynamic library overrides required

UnleashedRecomp is a legacy software modernization project that uses static binary recompilation to enable native execution on Windows and Linux. Its primary purpose is to remove the need for emulation while updating old applications to support modern hardware and high-resolution displays. The project implements a game modding infrastructure that allows for the loading of external assets and custom software tweaks using standardized modification formats. It also includes an achievement tracking system that mirrors original platform notifications and a dedicated menu for monitoring progress.

SerpentAI is a game AI development kit and computer vision framework designed for building autonomous agents that interact with video games. It serves as a game input automation tool and a machine learning model integration engine, allowing developers to create agents that perceive game states and execute actions. The framework utilizes a plugin-based agent architecture to provide modular extensions for game-specific logic and behaviors. It features a specialized system for training, bundling, and deploying machine learning classifiers to recognize visual contexts and game states in real time

Minecraft 启动器 Plain Craft Launcher（PCL）。

egret-core is a cross-platform game engine and mobile application framework used to develop 2D and 3D software for Android, iOS, and Windows. It serves as a multi-platform graphics engine and input handler designed to maintain consistent visual output and interaction behavior across different hardware. The project provides a game physics and animation suite that integrates external libraries for skeletal animations, particle systems, and complex physics simulations. It utilizes a hardware-abstraction layer to standardize touch, keyboard, and mouse interactions across multiple operating system

CyberEngineTweaks is a modding framework for Cyberpunk 2077 that provides a suite of tools for engine patching, scripting extensions, and the creation of interactive in-game modification interfaces. It functions as a scripting engine extension and patching tool designed to modify engine behavior and add custom game logic. The project distinguishes itself by combining a script-injection framework with a graphical user interface library, allowing for the development of custom settings menus and overlays directly within the game engine. It enables low-level engine modifications to improve perfor

Mindustry is a cross-platform game engine and factory automation simulation that combines resource management with tower defense strategy. Players construct complex supply chains and automated networks to process materials while building defensive structures to protect a core from waves of hostile mechanical forces. The project utilizes a deterministic lockstep networking model to ensure simulation consistency across desktop and mobile devices. It is built on an entity-component-system architecture and a tile-based grid simulation, allowing for the efficient management of thousands of active

umu-launcher is a suite of tools designed to launch Windows game binaries on Linux systems. It serves as a runtime orchestrator and compatibility layer launcher that enables cross-platform software execution. The project manages game compatibility through a fix manager that retrieves and applies specific patches and configurations based on unique store identifiers. It also functions as a data isolation tool, allowing for the specification of custom directory paths to keep game configurations and save data separate from the host system. The system automates the deployment of runtime environme

Starward is a third-party game launcher and management application for miHoYo titles, serving as an alternative to official distribution software for installing, launching, and managing these games. The project integrates a game account manager for switching between user profiles and regional servers without manual re-authentication. It also includes a gacha pull tracker for archiving historical summoning data and rewards, and a gameplay statistics monitor to record total playtime and activity history. The application further provides a centralized media gallery for organizing and viewing ca

PCL-CE is a cross-platform game launcher and runtime environment designed to execute Windows game binaries on macOS and Linux. It functions as a game version manager and a build system for compiling source code into Windows executables from non-Windows development environments. The project provides a cross-platform runtime layer that facilitates the launching and execution of Windows-based game sessions on different operating systems. It includes a binary cross-compiler and a build pipeline that allows for the generation of Windows binaries from macOS and Linux hosts. The software covers gam

Ambient is a cross-platform multiplayer game engine and runtime environment developed in Rust. It provides a system for building and deploying high-performance games that run across web browsers and desktop platforms using WebAssembly and WebGPU. The project features a networked database that automatically replicates real-time state and components between servers and players. It utilizes WebAssembly sandboxes to isolate game logic, which prevents individual script crashes and allows for the secure execution of untrusted code. The framework includes a graphics system for high-fidelity 3D visu

Minetest is an open-source voxel game engine and platform used to create and share moddable 3D block-based games. It provides a framework for building interactive grid environments and generating custom voxel worlds. The project features a Lua-based modding framework that allows for the extension of game behavior and the addition of custom content without altering the core engine. This data-driven system supports a dedicated workflow for modifying game environments and logic. The engine supports multiplayer game hosting through a dedicated server architecture, enabling multiple players to co

Julius is a cross-platform game engine and simulation tool designed for the reimplementation of legacy games. It executes original game logic using the original assets while applying modern resolution and interface updates. The engine features a localization framework for integrating community translations of text, audio, and video, and an integrated scenario editor for configuring gameplay rules and resource requirements within map data files. The project covers a broad capability surface including save game management with automated backups, input mapping for diverse keyboard layouts and t

Endless Sky is an open-source space trading simulation, 2D space combat simulator, and narrative exploration game. It functions as a plugin-based game engine that allows users to explore a vast universe, engage in tactical ship battles, and progress through a central plot within a sandbox environment. The project is distinguished by its highly moddable architecture, utilizing a directory-based plugin system and data-driven entity definitions to allow for content extensions and behavior overrides without recompiling source code. It further supports visual customization through programmable ver

Gameplay is a high-performance C++ game engine and cross-platform framework designed for developing 2D and 3D interactive games. It functions as both a 3D graphics engine for rendering environments and a 2D game development kit for creating sprite-based mechanics. The framework provides a cross-platform abstraction layer to ensure that game logic and graphics run across various hardware and software platforms using a shared codebase. The engine implements a hardware-accelerated rendering pipeline and component-based game logic to separate data from behavior. It utilizes a native C++ impleme

MelonLoader is a game engine plugin loader designed to inject custom code and load external plugins into Unity games. It functions as a modding framework that supports both Mono and Il2Cpp runtimes, allowing for the modification of games across different backend architectures. The project enables the patching and hooking of functions within Unity games, specifically providing a system for managing C# assemblies in Mono environments and a framework for patching the Interop C++ backend used by Il2Cpp. The system handles the interception of the application boot process to load third-party mods

Shattered Pixel Dungeon is an open-source roguelike dungeon crawler built as a turn-based strategy game. It features procedurally generated levels, hundreds of collectible items, and permadeath mechanics, all rendered from a single Java codebase that runs on Android, iOS, and desktop platforms. The game offers six distinct hero classes, each with branching subclass trees, endgame abilities, and talent points for deep character customization. Players battle over 60 enemy types, 30 traps, and 10 bosses across five dungeon regions, while managing equipment, enchantments, and alchemy-crafted gear

devilutionX is an open-source, cross-platform reimplementation of the original Diablo 1 game engine. It is a software framework designed to run the original action RPG logic and mechanics on modern operating systems by rewriting the engine in a current programming language. The project modernizes the legacy experience by adding support for widescreen resolutions, high-definition scaling, and configurable input mapping for various hardware controllers. It also introduces quality-of-life enhancements such as health bars, auto-loot, and tools to modify game speed and combat rules. The engine co

Bloxstrap is a custom game bootstrapper and configuration tool for Roblox. It replaces the standard launcher to enable advanced startup configurations, inject internal engine flags, and manage a specialized installation directory. The project provides a client mod manager that allows users to override local assets, such as sounds, textures, and fonts, and ensures these customizations persist across game updates. It includes a configuration utility to unlock hidden graphics settings and engine parameters, alongside a server tracker that identifies the geographic location of active game servers

OpenMW is a modern, open-source game engine designed to execute the game Morrowind and its expansions. It serves as a cross-platform game runtime and 3D world renderer, providing a data-driven environment to run game logic and physics with improved stability. The project functions as a game modding framework, utilizing a modular plugin system and an interpreted scripting layer to load external modifications. This architecture allows for the integration of community content, custom textures, and external scripts without altering the base executable code. The engine covers a broad range of cap