Open-source alternatives to NeoForge

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.

Tapable is a JavaScript plugin architecture framework and event-driven hook library. It serves as a high-performance callback engine and asynchronous workflow coordinator for building extensible systems. The library differentiates itself by compiling plugin logic into cached functions to minimize dispatch overhead. It provides a variety of execution patterns, including serial, parallel, and waterfall flows, as well as looping sequences and short-circuit execution. The framework covers the definition of custom event hooks, the management of plugin execution ordering, and the interception of h

JaCoCo is a Java code coverage tool and bytecode instrumenter that measures which parts of source code are executed during tests. It functions as a runtime agent to monitor application execution on the fly or as a library for offline bytecode instrumentation, allowing it to capture execution data in environments where runtime agents are restricted. The project distinguishes itself by providing both dynamic and static instrumentation paths to track execution. It includes a runtime agent for on-the-fly monitoring and the ability to modify compiled class files before execution. It further enable

jvm-sandbox is a bytecode instrumentation framework and plugin container for the Java Virtual Machine. It acts as a runtime application modifier that enables the injection and modification of bytecode in a running process without requiring an application restart or changes to the original source code. The system provides a non-invasive aspect-oriented programming framework to intercept method execution and alter behavior in live processes. It functions as an isolated environment for functional modules, employing a custom class loader hierarchy to prevent dependency conflicts between plugins a

Recaf is a suite of specialized tools for assembling, editing, deobfuscating, decompiling, and instrumenting Java bytecode and runtime processes. It provides a coordinated environment for modifying compiled Java class files and analyzing the behavior of Java applications. The project distinguishes itself through a multi-level abstraction layer that allows for editing across different formats and a pluggable framework that routes bytecode through multiple configurable decompilation engines. It includes an embedded scripting engine and plugin architecture to automate repetitive tasks and extend

lakeFS is a data lake versioning system that provides Git-like branching and commits for large datasets stored in object storage. It functions as a version control layer, enabling the creation of immutable snapshots, atomic commits, and zero-copy branching to create isolated environments for data experimentation without duplicating physical files. The system serves as an S3-compatible storage gateway and an Iceberg REST catalog, allowing standard cloud storage protocols and compatible clients to manage versioned tables. It acts as a data quality gatekeeper by using an event-driven hook system

btrace is a Java dynamic tracing tool and instrumentation framework designed for real-time diagnostics. It enables the injection of monitoring code into running Java virtual machines to analyze behavior and diagnose processes without requiring an application restart. The platform features a dynamic probe engine for executing single-line debugging commands to print data and trace call stacks. It provides an extensible tracing framework that supports custom functionality and external integrations through isolated implementation modules. The system covers runtime performance monitoring, method

This project is a plugin framework for extending autonomous LLM agents. It enables the integration of external scripts and third-party services into an agent's workflow without modifying the core code. The framework utilizes an event-driven hook system to execute plugin functions at predefined stages of an agent's lifecycle. It includes a sandboxed code executor to run external extensions in a secure, isolated environment. The system manages the lifecycle of external modules through a dependency injection manager and supports loading extensions from local directories or zipped archives. Conf

TShock is a server management tool and plugin framework for dedicated Terraria servers. It functions as an administrative suite and anti-cheat tool designed to control player permissions, monitor game integrity, and extend server functionality. The project provides a framework for creating custom plugins that modify the game world and implement new commands. It enables internal state modification through bytecode injection, packet interception, and memory manipulation to bypass engine restrictions and alter live game environments. Administrative capabilities include a hierarchical role-based

Arthas is a Java diagnostic tool and runtime debugger designed for real-time troubleshooting of applications. It functions as a remote diagnostics agent that allows users to inspect the runtime state of a Java process, including its heap objects and classloader hierarchies, without requiring a process restart. The project distinguishes itself through advanced bytecode manipulation capabilities, enabling live class hotswapping and the modification of bytecode in running processes. It supports in-memory source compilation and runtime bytecode decompilation to verify and update logic instantly w

Byte Buddy is a runtime code generation and bytecode manipulation library for Java. It provides a fluent API for creating and modifying Java classes during execution, enabling developers to define class structures, methods, and fields programmatically without requiring a compiler or direct bytecode assembly. The library supports agent-based class transformation, allowing loaded classes to be modified during JVM startup or runtime through a Java agent that intercepts class loading. It offers bytecode-level method interception for fine-grained control over method behavior, annotation-based code

This is an open-source Python SDK for building and orchestrating production-grade AI agents. It provides a unified framework for creating conversational agents that can use tools, maintain state, and coordinate across multiple language model providers including OpenAI, Anthropic, Google, Amazon Bedrock, and locally-hosted models. The SDK supports multi-agent orchestration through graphs, teams, and swarms, allowing several specialized agents to collaborate on complex tasks. Agents can be composed as callable tools that other agents invoke, and the framework includes policy handlers that inspe

Taskwarrior is a command-line task manager that lets you create, modify, filter, and complete to-do items directly from the terminal. It stores all tasks in a single plain-text file for portability and manual editing, and includes a custom expression language for selecting tasks by status, priority, tags, and date ranges. The tool distinguishes itself through several integrated capabilities. It computes a numeric urgency score for each task based on weighted factors like age, tags, and due date to determine ordering. A recurrence template engine generates new task instances from a template af

Pinpoint is a distributed application performance monitoring and tracing system. It functions as an application performance monitor and topology visualizer designed to analyze the execution behavior of large-scale distributed applications. The system uses bytecode instrumentation to monitor applications without requiring changes to the original source code. It captures call stacks and request flows across interconnected services to visualize system dependencies and generate real-time architectural maps of communication patterns. The platform covers a broad range of observability capabilities

Pinpoint is a distributed application performance management tool designed to trace requests and monitor metrics across large-scale distributed architectures. It functions as a request tracer, topology mapper, and JVM application monitor, providing a backend capable of collecting and visualizing trace data from OpenTelemetry compatible sources. The system distinguishes itself through a combination of bytecode-based instrumentation via a Java agent and topology-based visualization that renders live maps of service interconnections. It captures execution flow across asynchronous boundaries, suc

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

Yabai is a system-level utility for macOS that provides automated window management and workspace organization. It functions as a tiling window manager that uses binary space partitioning to arrange application windows into grid layouts, bypassing standard desktop constraints through direct interaction with the system window server. The project distinguishes itself by offering granular control over the graphical user interface via a socket-based command interface and event-driven system hooks. This allows for the programmatic manipulation of window states, display configurations, and virtual

Hammerspoon is a programmable automation engine for macOS that enables deep system-level control through a Lua scripting environment. By bridging high-level scripts with native Objective-C APIs, it allows users to interact with the operating system's accessibility tree, intercept hardware input streams, and manage the lifecycle of running applications. The project distinguishes itself through an event-driven architecture that registers asynchronous hooks for system notifications and hardware events. This allows for real-time automation, such as remapping keyboard and mouse inputs, managing wi

Wandb is a centralized platform for machine learning experiment tracking, model registry management, and workflow orchestration. It provides a comprehensive suite of tools for logging, visualizing, and versioning training metrics, model artifacts, and hyperparameter sweeps to ensure reproducibility across development cycles. The platform also functions as an observability tool for large language model applications, enabling the tracing of execution steps, token usage, and reasoning processes. The project distinguishes itself through its event-driven automation capabilities, which allow users

FreeScout is a self-hosted, open-source help desk and ticket management system built with PHP. It functions as a customer support platform that enables teams to manage shared inboxes and organize customer email conversations into tickets. The platform distinguishes itself as a multi-channel support dashboard that integrates customer relationship management and a knowledge base system. It provides tools for tracking detailed customer profiles and organizational records while offering a programmable interface to manage and expose support articles. The system covers a broad range of support cap

Failsafe is a JVM fault tolerance library and resilience pattern framework. It provides a toolkit for implementing circuit breakers, rate limiters, and other stability patterns within Java Virtual Machine applications to prevent cascading failures in distributed systems. The project is distinguished by its policy-based execution pipeline, which allows for the composition of multiple resilience patterns into a sequential flow. It features a state-machine circuit breaker to manage service recovery and a leaky-bucket rate limiter to control operation frequency. The library covers a broad range

Iris is a graphics modifier and OpenGL shader engine for Minecraft. It functions as a tool for improving visual fidelity and lighting effects by loading and rendering shader packs through custom pipelines. The project serves as a compatibility layer for modded environments, ensuring that high-fidelity shaders run stably alongside other game modifications without causing software conflicts or crashes. It also acts as a render performance optimizer to maximize GPU utilization and maintain stable frame rates while processing complex visual effects. The system utilizes real-time render intercept

cc-connect is an AI agent messaging bridge and session manager that connects local AI coding agents to third-party messaging platforms. It acts as a multimodal AI chat relay and a OneBot protocol gateway, allowing users to control local AI agents remotely via a variety of chat interfaces. The project distinguishes itself by providing a remote AI agent controller that enables the management of agents through slash commands and a web management dashboard. It supports multi-tenant project orchestration and session-based context isolation, ensuring that independent conversation threads are mainta

This project is an open-source learning management system built as a web-based application on the Frappe framework. It provides a structured environment for creating, managing, and delivering educational curricula, allowing administrators to organize learning materials into hierarchies of courses, chapters, and lessons. The platform is distinguished by its metadata-driven architecture, which defines application entities and database schemas through JSON-based definitions rather than hard-coded classes. This approach enables dynamic runtime customization of the user interface and data models,

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

LSPatch is an Android runtime hooking tool and non-root app patcher. It provides a non-root implementation of the Xposed framework, allowing for the modification of Android application behavior without requiring administrative system access. The project enables the integration of Xposed modules into specific applications by embedding the necessary API components directly into the application package. This allows for application sandbox customization and the execution of framework modules on standard devices. The framework achieves these modifications through dex-based method hooking, dynamic