"A guide to finding data in public databases" matching MCP connectors:

Generate synthetic random user data for testing, demos, and development without using real persona.

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.

Drive real Android & iOS devices and web browsers from natural language for mobile + web QA. 145+ tools across device control, app management, automation sessions, browser automation, and flow recording / replay. Bearer-auth — get a token at robotactions.com → Profile → API Tokens.

Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

Check that your AI is being logical. Free tool that mathematically catches contradictions in agent reasoning. No account needed. Also offers paid guardrails that converts natural language to formal verification proofs, that anyone can check succinctly.

Hosted MCP server to lint SKILL.md files: packaging checks, regex tests, JSON validation, diffs.

Verify scraped data against the live source page. Signed verdicts, $0.01 via x402.

Score any URL against a real design contract — 40 checks, A-F grade, token + motion validation.

A skeptical senior-engineer code reviewer over MCP: risk-scans unified diffs, flags AI-generated-code tells, reports complexity hotspots, scans for leaked secrets, and runs an OWASP security pass — real analyzers, no external APIs. Free tier, no signup.

A fully free linter for agent skill files: lint_skill validates YAML frontmatter, structure, size budgets, and safety phrasing with a pass/fail verdict; packaging_check validates zip layout against marketplace rules; plus regex_test, json_validate, diff_texts, and cron_explain for skill authors. No license or account required.

Scan any website or MCP server for agent readiness: 0-100 score, a fix per failing check. Free.

X-Z-CS AI validation with auditable reasoning. 8 active tools; 5 in maintenance. v0.5.61

Give AI coding agents access to your Vynix visual feedback, bug reports, and AI diagnosis.

Post-scrape data cleaner, no LLM: repairs mojibake, HTML, invisible chars. Plus a verdict.

Exposes FEDLIN's public security scanners as agent-callable tools over Streamable HTTP.

Benchmark-first release surface with a read-only MCP endpoint and operator CLI.

A webhook inbox for agents: one call returns a live URL. Mock, verify, inspect and replay.

Unpaid qualification-gated operational_context canary. Staging data. No wallet.

Accessibility pre-checks (WCAG/BFSG) in a real browser + statement drafts. Pay per call.