"Free Graph and Network Visualization Tools (No API Key Required)" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Shared project memory for AI coding agents: decisions, lessons, risks and tasks in one graph.
formcarry handles everything after your form is submitted: it emails you, auto replies to the person who submitted, filters spam, and delivers webhooks. You write the HTML form and set its action to a URL formcarry gives you. An agent can create a form, wire the emails and webhooks, and answer questions about the submissions, like how many signups last week.
Validate and generate German e-invoices (XRechnung, ZUGFeRD) against the official KoSIT rules. Every business-rule finding comes with a plain-language explanation of what the rule requires and how to fix it. Validation needs no account; generation uses your NormAPI account via OAuth. Invoices are never stored.
Go MCP server for GitLab: 2 dynamic tools reach 1000+ REST/GraphQL actions. Free/CE, no paid tier.
Writes your daily standup from GitLab or GitHub merge request state: what's ready, blocked or waiting on your review, and why a pipeline is red, read from the failing job log. OAuth sign-in, no API keys; can post the note to Slack, Discord or Google Chat on a schedule.
Generate synthetic random user data for testing, demos, and development without using real persona.
npm package trends and weekly downloads over time. Free key at trendsmcp.ai
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Open AI models through one OpenAI-compatible API: chat, live model list, prices and cost estimates.
Signed, traced record of what an npm package or file attempts when run, network included. No key.
Agent-native registry to discover APIs, MCP servers and CLIs, with live health checks.
Run Python, Java, C, C++, C#, Go, Rust and 39 more languages, each run in a fresh, offline sandbox.
Connect Claude.ai, ChatGPT and MCP-compatible coding clients to aictrl engineering workflows. Check account readiness, find and run tasks, inspect workflow progress and approvals, review pull-request findings, and query repository context. Uses OAuth and your aictrl organisation's permissions.
Onchain DeFi intelligence API for Base, payable per call with x402 (USDC). Live MCP tools: get_bot_status (Telegram bot health), get_market_stats (market snapshot), get_onchain_sales (proven revenue from live x402 routes). Built for agents that need verifiable onchain data — whale flow, signals, and sales evidence at $0.003/call.
Design quality gate for AI-generated UI: score any URL on 45 deterministic checks, A–F grade.
A portable knowledge-graph memory you pass in and get back. No database. 4 of 6 free.
Search and read the Goldsky documentation from any MCP client. Goldsky provides onchain data for apps and finance teams across 150+ chains. ### Products - **Feeds**: REST APIs for wallet balances and transfers, with USD values, on 8 EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB Chain, Robinhood Chain, Arc). $0.35 per 1,000 requests. [Docs](https://docs.goldsky.com/feeds) - **Datasets**: prebuilt onchain datasets: blocks, logs, traces, ERC-20/721/1155 transfers, balances, Solana DEX trades, stablecoin and RWA transfers, and Hyperliquid fills. [Browse datasets](https://app.goldsky.com/explore) - **Turbo pipelines**: stream any dataset into your database, queue, or webhook. - **Subgraphs**: managed subgraph hosting, compatible with The Graph. - **Edge RPC**: managed RPC endpoints. ### Tools - `search_goldsky`: search the docs. Returns snippets with links. - `query_docs_filesystem_goldsky`: read full doc pages. - `submit_feedback`: report a problem with a docs page. ### Connect **URL**: `https://docs.goldsky.com/mcp`. Streamable HTTP, no authentication.
Tailwind CSS palettes (50-950) from any color, the closest Tailwind color, and Tailwind's defaults
Prove end users to agents and apps: login-links, OIDC clients, and API keys over remote MCP
Thermal label MCP server: render, validate, debug and convert ZPL, EPL, TSPL and CPCL labels.
