Open-source alternatives to Steamless

Fabric API is a modular framework designed for Minecraft mod development, providing a standardized set of hooks and libraries that enable the integration of custom content into the game. It serves as a foundational toolkit for injecting custom logic, assets, and networked data into the game environment during both startup and runtime phases. The framework distinguishes itself by facilitating interoperability between independent modifications through shared events and interface-based contracts, which allow different mods to interact without requiring direct dependencies. It manages the complex

Geode is a game modification SDK and mod loader for Geometry Dash. It functions as a hooking engine and UI framework that allows for the injection of dynamic libraries to alter game behavior and add new features. The toolkit distinguishes itself through a centralized mod compatibility manager and hook registry that tracks active modifications to prevent logic conflicts and application crashes. It utilizes a trampoline-based hooking engine to redirect game function calls while preserving native call stacks, alongside a dedicated UI framework for rendering custom popups and interface components

JPEX Software is a comprehensive reverse engineering suite for SWF binary files, serving as an ActionScript decompiler and editor. It provides a toolkit for decompiling, analyzing, and modifying the internal structure of compiled Flash content, including the extraction of scripts and media assets. The project is distinguished by its ability to perform direct binary modification, allowing users to edit bytecode and replace embedded resources without reverting to high-level source code. It includes a runtime ActionScript bytecode debugger for variable inspection and call stack analysis, as well

FiveM is a multiplayer modification framework and game engine modding tool. It serves as a platform for creating and hosting community-driven modifications for open-world game engines, functioning specifically as a framework for Grand Theft Auto V to enable custom servers and multiplayer game modes. The project provides a dedicated game server host for managing network traffic and synchronized game states in modified environments. Its capabilities extend to modding Red Dead Redemption 2, allowing for the extension of game mechanics and the addition of custom content. The framework supports c

This repository contains the original source code for a classic real-time strategy game, serving as a legacy game engine implementation for managing units, maps, and combat mechanics in a military strategy setting. It functions as a real-time strategy game source code archive intended for preservation and technical study. The codebase acts as a game modification base, allowing developers to create custom content and modifications using the original source. It provides a foundation for retro game modding and software archeology to analyze how historical game mechanics were programmed. The pro

pe-sieve is a set of diagnostic tools for scanning Windows process memory to identify malicious implants, shellcode, and hooks. It functions as an in-memory implant detector, malware unpacker, and process callstack analyzer designed to locate and dump memory patches and injected code from running processes. The project identifies advanced evasion techniques, such as process hollowing and reflective injection, by verifying portable executable structures in memory. It distinguishes itself by analyzing process callstacks to detect anomalies and redirections and by reconstructing executable heade

This project is a toolkit for reverse engineering, modifying, and re-signing Android application packages. It provides a suite of utilities designed to decompile compiled binary files into readable source code and translate low-level bytecode into formats suitable for human analysis. The tool facilitates security auditing and research by allowing users to extract and interpret manifest metadata, decode Unicode sequences, and inspect internal application logic. Beyond analysis, it supports the modification of application packages, enabling users to rebuild and re-align files to optimize perfor

Fernflower is a Java bytecode decompiler designed to convert compiled Java class files back into human-readable source code. It functions as a bytecode analysis tool that recovers original program logic and structure from compiled binaries. The project includes capabilities for obfuscated identifier resolution to rename ambiguous member elements, ensuring clear identifiers in the resulting source. These features support the analysis of obfuscated code, legacy code recovery, and Java malware analysis for security auditing. The system utilizes a structural analysis pipeline that includes contr

Luma3DS is a custom firmware for the Nintendo 3DS that removes factory restrictions to enable the execution of unsigned homebrew and game modifications. It functions as a kernel-level system extension that hooks system calls to bypass hardware limitations and introduce new operating system capabilities. The project serves as a homebrew payload loader, using boot-time mechanisms to launch third-party software and custom firmware versions. It also provides a game modding framework capable of patching executable code and intercepting file requests to load custom assets and modified data. The en

UABE is a specialized toolset for extracting, modifying, and converting assets stored within Unity engine bundle files. It functions as an asset bundle extractor and a game modding utility designed to alter 3D meshes, textures, and audio within Unity games. The project includes an asset format converter that transforms internal Unity data into common file formats for external editing. It also features a mod installer generator to create standalone installation packages from modified asset bundle files. The software provides capabilities for game resource extraction and asset conversion, allo

ArchUnit is a Java architecture testing library and automated validator that analyzes compiled bytecode to verify that source code adheres to predefined design rules. It functions as a testing framework that fails builds when the actual code structure violates architectural constraints. The library uses a fluent rule specification to define constraints and employs bytecode analysis to inspect class relationships and package dependencies. This allows for the automated detection of circular dependencies and the enforcement of dependency rules between packages. The tool covers a range of struct

The GoldSrc game engine is a 3D game framework and first-person shooter engine designed for building and running interactive software. It functions as a moddable game framework, providing a system for creating custom game rules and content through client-side code and shared libraries. The project includes a game engine SDK and development tools for compiling custom game logic into dynamic link libraries. This modular structure allows for the development and distribution of game modifications on Windows and Linux platforms.

NeoForge is a development framework and programming interface designed for modifying the Minecraft Java Edition game engine. It provides a standardized environment that allows developers to inject custom logic, extend core gameplay mechanics, and introduce new content into the game. The platform distinguishes itself by utilizing a system of hooks and registry patterns that manage how modifications interact with the game engine. It maintains stability across different versions by separating client and server execution environments and automating the discovery and loading of mod packages. The

dex2jar is an Android dex decompiler and reverse engineering tool designed to convert Dalvik executable bytecode into Java class files. It functions as a bytecode converter that transforms compiled Android binaries into a format compatible with standard Java analysis tools. The project facilitates Android app decompilation and Java bytecode recovery by translating executable files into readable structures. This allows for the analysis of application logic and the identification of security vulnerabilities or malicious behavior during Android malware analysis. The tool performs static bytecod

Warzone 2100 is an open-source real-time strategy game engine focused on tactical combat and base building. It operates as a real-time strategy game engine utilizing a data-driven asset pipeline and providing cross-platform support. The project features a modular unit design system that uses a technology tree to construct combat entities by combining chassis, propulsion, and weapon components. It includes a lockstep multiplayer network engine to synchronize game state across distributed clients for competitive matches, as well as a JavaScript game scripting framework for implementing custom l

dnSpy is a specialized toolset for the reverse engineering, analysis, and modification of compiled .NET binaries. It functions as a decompiler that converts assemblies back into readable high-level source code, an assembly editor for modifying bytecode and metadata, and a debugger for inspecting compiled binaries. The project integrates a hex editor specifically for inspecting and modifying raw bytes and Common Intermediate Language structures. It allows for the direct modification of binary contents to change application behavior without requiring the original project source files. The tool

SSELauncher Comfy Edition 2018 By LoodBot/Syahmixp (Steam Emulator)

A fork of Good Old Downloads' "GOG Games" project.

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