"Services or tools available for free without requiring an API key" matching MCP connectors:
GET /v1/connectors — MCP directory API referenceMatching Connector Tools:
Agent-design pattern guidance via 8 hosted read-only tools; Streamable HTTP, no auth, one Release.
Simulate, test, and analyze cloud architectures without deploying real infrastructure. Cloud World Model enables AI agents to model cloud environments, evaluate architecture behavior and costs, run failure and chaos simulations, and explore infrastructure scenarios across cloud providers.
Render, validate, encode/decode PlantUML diagram-as-code; 22 diagram types. Free, no auth.
Services, case studies, articles and contact details of software architect Dan Podina.
Architecture docs and patterns for NestJS + Nuxt full-stack apps
40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP.
OSS libs in your stack, really used: source, tests, callers. C#, Java, TS, Python, Rust, PHP+.
Read-only, source-backed compatibility lookups and approved changes for ResolveMesh's catalog.
AI agent draws editable hand-drawn diagrams (flowchart, ER, architecture) via MCP, not static images
MCP gateway with 10 tools for code analysis, architecture, package audit & security.
AI-powered diagrams, mind maps, flowcharts on a free unlimited collaborative whiteboard
AI data-center design engine: size, validate & lay out Rubin-era data centers. Korea live.
Geometry and CAD file metadata extraction for STL, OBJ, PLY, PCD, LAS/LAZ, glTF/GLB.
Create and edit architecture diagrams from your AI agent; get an SVG and a live editable canvas.
MCP server for AI Diagram Maker — generate software engineering diagrams from natural language, code, ASCII diagram, images, or Mermaid. Inline diagram rendering using MCP apps UI and diagram URL in responses. Works with Cursor, Claude Desktop, Claude Code, and any MCP-compatible AI.
Parse Excalidraw diagrams and documents into clean Markdown or structured JSON via x402 pay-per-call API. Agents pay per call with HTTP 402 micropayments — no signup, no API key. Free tier: 5 parses/day. Premium: $0.05/call unlimited with LLM decomposition.
EN Diagram — structural verification for concurrent systems. Pure math, no AI.
Create and edit flowcharts, mind maps, wireframes, and docs in Whimsical, or search your workspace.
Draw your app's architecture on a live canvas and flag the bottlenecks and security gaps.
Compile full-stack apps from one architecture spec, with a shared Memory Fabric.
