Open-source alternatives to Debugger

Agent-skills is a collection of structured instructions and behavioral personas designed to standardize how AI coding agents perform engineering tasks. It functions as a workflow orchestrator that maps natural language intent to repeatable technical sequences and verification checklists. The project distinguishes itself through the use of specialized markdown-defined roles, such as security auditors or test engineers, to apply targeted domain expertise. It employs an evidence-based verification model that requires runtime data or passing tests as mandatory exit criteria to ensure AI-generated

node-inspector is a web-based debugger for Node.js applications that integrates the Blink developer tools interface. It functions as a runtime profiler and inspection suite, providing a remote debugging interface to connect a local browser to a Node.js process. The project enables live code iteration, allowing source code to be modified while the process is running and persisting those changes back to the physical file system. It also includes a JavaScript runtime profiler to monitor CPU and heap usage for identifying bottlenecks and memory leaks. The tool covers execution flow control throu

localForage is a browser storage wrapper and key-value store that provides a unified JavaScript API for persisting data. It acts as an abstraction layer over IndexedDB, WebSQL, and localStorage, allowing web applications to save data offline. The library features a priority-based driver fallback system that automatically detects and selects the most capable storage engine available in the browser. It simplifies data management by providing an asynchronous interface for storing complex JavaScript objects and binary buffers without requiring manual serialization. The project covers broad capab

Reactotron is a desktop application and collection of developer tools designed for monitoring runtime errors, analyzing network requests, and inspecting state within JavaScript and React environments. It serves as a debugger for both React JS and React Native projects, providing a visual interface to monitor internal application state and performance. The tool provides specialized inspectors for React Native mobile applications and React web applications. It allows for the real-time tracking of state changes and the dispatching of actions to a state manager to test different application scena

Puppeteer Sharp is a .NET wrapper and automation library used to programmatically drive headless Chrome and Chromium browsers. It functions as a Chrome DevTools Protocol client, providing a framework for web scraping and the automation of web page interactions. The project enables the execution of JavaScript within the browser context and supports attaching to remote browser sessions via WebSocket endpoints. It allows for the manipulation of browser states to perform functional web testing and visual regression analysis. Capability areas include content transformation via HTML injection, pag

Suricata is an open-source network intrusion detection and prevention engine that analyzes live network traffic in real-time to identify and alert on malicious activity. It operates as a rule-based threat detection system, matching traffic against user-defined signatures to detect known attack patterns and policy violations, and can be placed inline to actively block malicious packets before they reach their target. The engine inspects a wide range of application-layer protocols including HTTP, DNS, TLS, SMB, and MQTT, and supports high-performance packet capture through specialized hardware a

FLEX is an in-app debugging tool and runtime exploration environment for iOS applications. It provides an integrated suite for inspecting and modifying the internal state of a running process without the use of an external debugger. The project includes a runtime inspector for browsing the memory heap and calling methods dynamically, alongside a view hierarchy debugger for visualizing and adjusting layout structures in real time. It features a network traffic monitor to log and analyze HTTP request history, headers, and responses, as well as a sandbox manager for viewing and editing files and

Reactotron is a desktop application for inspecting the state, network traffic, and logs of React and React Native applications. It serves as a specialized debugging interface for monitoring network requests, performance metrics, and state transitions in JavaScript and mobile application frameworks. The tool provides a real-time interface for tracking data flow and dispatching actions to test different state transitions. It includes a network traffic monitor to intercept and display API requests and responses, as well as a performance analysis tool for capturing execution data and measuring op

pydoll is a Chrome DevTools Protocol automation library and headless browser controller used for web data extraction and parallel browser automation. It controls Chromium-based browsers via direct WebSocket connections, allowing it to manage isolated browser contexts and tabs while bypassing the overhead and detection associated with WebDriver. The project features an anti-bot evasion framework that mimics natural human behavior, including mouse movements generated via Bezier curves and variable typing patterns. It provides specialized stealth capabilities to bypass behavioral analysis and au

Thorium is a web browser built from the Chromium project, designed for high performance and expanded compatibility. It utilizes aggressive compiler optimizations and CPU-specific instruction sets, such as AVX2 and SIMD, to increase page rendering and JavaScript execution speeds. The project distinguishes itself by providing custom builds that enable modern web browsing on legacy versions of Windows and Linux. It further diverges from standard browser implementations by integrating Widevine DRM and native support for high-efficiency media formats, including HEVC and JPEG XL. Broad capabilitie

nodriver is an asynchronous Chromium browser automation framework that provides headless control and web scraping capabilities. It functions as a Chrome DevTools Protocol client, allowing for granular engine control by attaching directly to the browser's debug port without the need for external driver binaries. The framework is specifically designed as an anti-bot detection bypass tool. It modifies browser fingerprints and protocol headers to evade automated security systems, handle security warnings, and bypass common obstacles like insecure connection alerts. The system covers a broad rang

BCC is an eBPF development toolkit and tracing framework used for monitoring and analyzing the Linux kernel. It functions as a performance analysis tool and debugging utility to capture system events, measure kernel latency, and provide network observability. The project distinguishes itself by providing a build system that integrates with LLVM to compile C-like code into BPF bytecode at runtime. It utilizes BPF Type Format data for relocations to maintain cross-kernel compatibility and extracts kernel headers to ensure the generated programs match the specific kernel version. The toolkit co

uBlock is a browser content blocker and web privacy tool designed to prevent advertisements and tracking scripts from loading. It functions as a network request filter, a DOM element hider, and a script execution controller to manage how web pages load and render. The project distinguishes itself through a combination of network-level request interception and cosmetic filtering. It uses declarative filter lists and pattern-based matching to block trackers and pop-ups, while employing CSS selectors and wildcard entity matching to remove visual components across multiple regional domain variant

This project is a comprehensive front-end development guide and roadmap designed to help engineers master the skills and professional standards required for modern web development. It serves as a technical reference for mastering HTML, CSS, and JavaScript, providing structured learning paths and a map of the professional competencies needed to transition from a beginner to a professional web engineer. The resource functions as a categorized directory and ecosystem overview of the JavaScript landscape. It catalogs industry-standard frameworks, libraries, and utilities, offering specific recomm

DoraemonKit is a mobile frontend development toolset designed to optimize the lifecycle of web and hybrid mobile applications. It functions as a comprehensive suite of productivity tools, providing specialized utilities for mobile UI inspection, web view debugging, and on-device performance monitoring. The toolset distinguishes itself through several targeted simulation and interception capabilities. It includes a network traffic interceptor for mocking API responses without modifying source code, a device state simulator for overriding GPS coordinates, and a mobile web debugging bridge that

CodeceptJS is a NodeJS end-to-end testing framework designed for automating acceptance tests across web, mobile, and desktop applications using a unified API. It serves as a cross-platform test automator and a behavior-driven development tool that maps human-readable feature files to technical step definitions. The framework features AI-powered test maintenance that uses machine learning to automatically identify and repair broken element selectors. It includes capabilities for autonomous test generation and a server that allows external agents to control tests and debug browser sessions in r

This project is a web accessibility checklist and inclusive design framework. It serves as a digital inclusion guide and audit tool for verifying that web content is perceivable, operable, and welcoming to a diverse global audience. The project provides a structured review process for WCAG compliance, focusing on auditing HTML structure, ARIA roles, keyboard navigation, and visual accessibility. It includes specific standards for reviewing language, typography, and color contrast to ensure inclusive content design. The framework covers broader capability areas including device compatibility

This project is a comprehensive library of reusable React hooks designed to simplify browser API integration, state management, and component lifecycle tracking. It provides a declarative interface for managing complex browser interactions, allowing developers to encapsulate imperative logic into modular, composable functions that integrate directly with the component lifecycle. The library distinguishes itself by offering specialized utilities for asynchronous data orchestration, including built-in caching, retry logic, and loading state management. It also features advanced performance opti

jetson-inference is a set of libraries and tools for executing optimized deep learning models on embedded GPU hardware. Its primary purpose is to enable real-time computer vision and AI inference at the edge with low latency and high throughput. The project distinguishes itself through high-performance streaming analytics and the ability to execute concurrent AI pipelines on auto-grade silicon. It provides specialized support for multi-sensor stream processing, utilizing zero-copy data transport to load camera frames directly into GPU memory. The codebase covers a broad surface of capabiliti

VisiData is a terminal-based interactive data analysis tool and browser designed for exploring, filtering, and sorting large tabular datasets. It functions as a structured data inspector that loads and flattens complex formats like JSON, XML, and PCAP into interactive sheets, as well as a terminal file manager for navigating directories and performing staged filesystem operations. The project distinguishes itself by rendering data visualizations, such as scatter plots and histograms, directly in the terminal using Unicode Braille characters. It provides a Python-based data wrangling environme

Pyppeteer is a Python library for controlling Chromium-based browsers using the Chrome DevTools Protocol. It functions as a headless browser automation tool, allowing for the programmatic navigation of web pages and the extraction of data from dynamic websites. The project provides low-level browser control through direct communication with the Chrome DevTools Protocol, enabling the interception and modification of network traffic. It differentiates itself by offering specialized performance profiling capabilities, including the measurement of JavaScript and CSS code coverage and the capture

This project is a JavaScript logging utility and namespace-based debugger used for printing formatted, color-coded debug messages to the console in Node.js, web browsers, and Deno. It serves as a console output formatter and execution time profiler to help identify bugs and track program flow. The system manages debug visibility through named namespaces, allowing specific groups of messages to be enabled or disabled via environment variables. It distinguishes different modules in the output stream by assigning specific colors to these namespaces. The utility includes capabilities for measuri

Dexie.js is a wrapper library for IndexedDB that provides a simplified interface for managing and querying structured data within the browser. It functions as a browser database manager used to maintain persistent application state and store binary blobs and records. The project serves as an offline-first data store that synchronizes browser data with remote servers to maintain consistency across sessions. It also acts as a reactive database store by monitoring data changes in real time to trigger automatic user interface updates, and functions as a client-side search engine for indexing and

AndroidHttpCapture is a mobile application for intercepting and analyzing HTTP and HTTPS network traffic directly on an Android device. It functions as a local proxy server and traffic interceptor to capture and monitor requests and responses from other installed mobile applications. The tool provides capabilities for MITM HTTPS decryption through root certificate installation and supports exporting captured network sessions as HAR files for external analysis. It allows for real-time response body injection and the modification of request headers via user agent spoofing. The project includes

Netfox is an iOS and macOS network debugging library designed to intercept and monitor HTTP traffic. It functions as an in-app HTTP traffic inspector that captures request headers and response bodies for real-time network analysis. The tool provides a network performance monitor to calculate response times and data sizes, as well as a network log exporter for sharing captured request and response data via email. The project covers network analysis capabilities including traffic filtering to exclude specific URLs, request body capture, and a debug interface that can be toggled via programmati

WeChatOpenDevTools-Python is a set of software utilities designed to bypass environment restrictions to enable debugging and element inspection for web and mini program applications. It functions as a developer tool unlocker and web inspector activator to force the activation of integrated inspection tools. The project provides specialized capabilities for debugging and reverse engineering WeChat mini programs. This includes the ability to access hidden developer consoles to analyze the structure, network requests, and behavior of active mini programs and web content. These utilities utilize

Pcap-Analyzer is a desktop utility designed for the forensic analysis of offline packet capture files. It functions by decoding binary network protocols into structured metadata, allowing users to examine network activity without requiring a live connection. The tool provides comprehensive capabilities for reconstructing communication sessions and extracting application-layer artifacts, such as transmitted files and credentials. It distinguishes itself through integrated geospatial mapping, which correlates source and destination network addresses with physical location databases to visualize