Awesome Dev Utilities is a curated collection of free, fast, and no-login online developer tools from LoopPlunk. It includes everyday utilities like SQL formatters, cron expression helpers, UUID and QR code generators, unit converters, text tools, and developer cheat sheets — all designed to save time and simplify common development tasks.

🗂️ A full-stack developer tool to save, search, and reuse code snippets — built with FastAPI, React, and SQLite.

Simulation environment for testing and validating autonomous agents

Clarity developer toolkit — safe math, SIP-010 helpers, token validation, basis points — used in production mainnet contracts

HookRadar — Free & open-source webhook tester, debugger & inspector. Real-time monitoring, payload analysis, request replay, cURL export. Self-hosted alternative to Webhook.site & RequestBin.

A curated collection of free online tools to boost productivity, optimize websites, and enhance SEO.

A community catalog of autonomous agents and bundles certified by passing TraceCore deterministic episode runs in public CI

Russian Business Data Generator

Scenario-first API client focused on understanding API behavior

GitGauge — Chrome extension that scores GitHub repository authenticity from stars/forks/watchers/issues ratios.

实战型开发教程与可运行代码示例库：Backend/Frontend/DB/AI/LLM/Cloud，一知识点一示例，能跑能学能用。

AI-powered VS Code extension using local Ollama models for inline code completion — a free GitHub Copilot alternative

ByteKit: 17 free browser-based developer tools — JSON Formatter, CSS/JS/HTML Formatter & Minifier, Regex Tester, JWT Decoder, Base64, Hash Generator, Color Converter, URL Encoder, Markdown. No login, no tracking.

QAstro.js is a modular library for automatic accessibility and security linting of web pages. Easily extensible with new rules

Store, search, and reuse code snippets fast with SnipVault, a personal snippet vault built for quick access and less copy-pasting

Local-first CLI for mocking HTTP APIs with YAML, JSON, and CSV-backed datasets

Stop AI from creating duplicate React components. A Claude Code, Kiro starter template with a component registry, pre-commit duplicate detection, and CLAUDE.md guardrails that force AI assistants to reuse what already exists.

Test and debug webhooks by creating endpoints, inspecting requests live, replaying them, and running the tool locally or on your server.

Chrome extension for clearing cookies, storage, and permissions with one click.

A high-performance tool to bundle your entire project into a single Markdown file for LLM context, featuring .gitignore support and client-side ZIP processing.