Best Developer Tools Tools

Mock blocked APIs, passthrough ready routes, see live source

Codex Claude Gemini CLI parallel agents orchestration

OpenAI's official Python SDK for building agentic AI applications. Lightweight framework with tool use, handoffs, and guardrails built in.

Open-source visual AI workflow builder. Build AI agents and chatbots with a drag-and-drop interface. Self-hostable with LangChain integration.

Open-source visual framework for building multi-agent and RAG applications. Native MCP support with ready-made agent components.

Graph-based agent orchestration framework by LangChain. Build stateful, multi-agent workflows with loops, branching, and parallel execution.

Developer-first application security platform. Scans code, cloud, containers, and dependencies for vulnerabilities in one unified dashboard.

Google's Node.js library for controlling headless Chrome/Chromium. Automate browser testing, scraping, screenshot generation, and PDF creation.

Open-source API development ecosystem. A lightweight, fast alternative to Postman for testing REST, GraphQL, and WebSocket APIs.

A modern, highly configurable terminal emulator with serial port support, SSH client, and extensive customization options.

Industry-standard desktop website crawler for technical SEO audits. Identifies broken links, duplicate content, crawl errors, and on-page issues.

Stop babysitting your terminal

Carbon footprint estimation API for developers to calculate emissions from electricity, flights, shipping, and vehicles with simple REST endpoints.

Shipping API for developers providing multi-carrier rate shopping, label generation, tracking, address verification, and insurance across 100+ carriers.

Developer blogging platform with custom domains, markdown editor, GitHub backup, and a built-in community — free hosting for tech writers and developers.

Developer-focused workflow automation platform with code-level control, 1000+ API integrations, and serverless execution — free for individual developers.

Python-based open-source RPA and automation platform for building, deploying, and managing software robots with cloud orchestration and developer tools.

Open-source durable execution platform for building reliable distributed applications and long-running workflows that survive failures and outages.

Self-contained serverless SQL database engine that runs inside applications — the most widely deployed database in the world, used in phones, browsers, and IoT.

AI code assistant that runs locally or in the cloud. Privacy-first code completion for teams with support for all major IDEs and languages.

Autonomous AI coding agent for VS Code. Handles complex multi-file tasks with terminal access, browser use, and human-in-the-loop approval.

AI pair programmer by GitHub and OpenAI. Get real-time code suggestions, chat assistance, and multi-file editing directly in your IDE.

Unified API gateway for hundreds of AI models. Access GPT-4, Claude, Llama, Mistral, and more through a single API with automatic fallbacks and cost optimization.

Meta's open-source large language model family. Download and run powerful LLMs for free with commercial-friendly licensing for research and production use.

Microsoft's platform for building custom AI copilots. Create conversational AI agents with low-code tools that connect to your business data and workflows.