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Phone number validation, formatting, carrier, line type and timezone. Free tier, RapidAPI key.

Checks AI-written references against Crossref, PubMed and OpenAlex, flags retractions, formats citations (APA, Vancouver, BibTeX) and draws PRISMA 2020 flow diagrams. Hosted, free, no account needed.

macOS terminal with a built-in MCP server: agents use your SSH hosts, Docker, live metrics and authorized_keys through the app's own connections, under a per-host policy (off / read-only / confirm / full) with an append-only audit log. Free, MIT.

Design posters, edit photos, and manipulate images directly from your terminal. Powered by Photopea -- a free, browser-based alternative to Photoshop -- connected to your AI agent via MCP.

Image to STL converter for 3D printing. Upload, preview, download. 2 free credits after verification.

Payments for AI agents over MCP: per-agent budgets and rules (allow, ask a human, block) checked server-side before a payment executes. Free sandbox with test money.

Growth marketing and building software with AI, for founders: search the free Growth Codex, Builder Codex and Insights guides, list upcoming online and Cologne events with the event card, and – after signing in – register for free events, see your pass and bookings, and get a checkout link.

Publish to Instagram from chat — official Graph API, OAuth 2.1, free for your own posts.

Search and retrieve royalty-free images and videos using the Pixabay API.

31 AI image processing tools — free local editing, AI background removal & upscaling, and paid product photo generation

Live, ranked events worldwide for AI agents: concerts, sport, festivals, nightlife and culture, with full city boards for 333 cities. Each event has a 0-100 score for how big a moment it is and a one-line reason. Tools: search_events, list_cities, get_event. Free, no key.

A production-clean MCP server for the free Open-Meteo weather API (geocoding, forecast, air quality) with SRE-grade rate limiting, backoff, and structured logging.

Independent Polymarket analytics - verifiable trader receipts, whale feeds, free Agent API and MCP. No trade advice.

Real-time tweet counters and market data for Polymarket's Elon Musk & Ted Cruz markets — hosted remote MCP server (streamable-http + SSE), free tier is keyless.

Verify POPCORN-WITNESS/2.0 receipts: signature, digest, and witnessed time. Free and read-only.

Let AI assistants search free backlink submission directories and get step-by-step submission checklists and guides for each platform.

Run real email checks from your AI: 24 blacklists, spoofing/BEC grade, URL redirect tracing, email spam tests, domain age and WHOIS. Free, no account.

Search a human-reviewed directory of free tools and projects, read entries and categories, run a website launch check, and suggest a product for review.

Read and write access to your own Povver strength-training data (set-level workout history, per-lift trends, muscle volume, routines, plans). Remote, OAuth 2.1, requires a Povver subscription (iOS app, 14-day free trial, then EUR 9.99/month or EUR 79.99/year).

Search thousands of professional PowerPoint templates and individual slides for business presentations. Free, read-only, no sign-in.

Checks whether a cold email to one address is allowed in the recipient's country before an agent sends it: a verdict, the rule with its legal source, what the footer must include and a signed receipt. Covers the UK, US, Canada, Germany, France, Australia, Ireland and the Netherlands. Free daily allowance, no sign-in.

MCP server for PRH (Finnish Patent and Registration Office). Free public API — look up any Finnish company by name, business ID, location, or industry. No auth required.

Producer AI is an online AI music generator that accepts a song description or lyric draft and advertises full tracks with vocals, fast generation, and royalty-free output language.

A free product launch checklist for indie makers, served over a no-auth MCP server with get_checklist, get_item and list_launch_types tools.

Turn a product page URL, or raw HTML you already have, into clean JSON: price, currency, stock, SKU/GTIN/MPN, images, rating and every offer. Each result says where the price came from (price_source), so agents can tell a structured price from a guess. Optional LLM-ready Markdown. Free keyless demo.

MCP server for freelancers — draft winning proposals in your voice from a client brief

Sales-prospecting MCP server: funding-round search with source URLs, new-round webhooks and $0.15 cited company briefs for Claude, Cursor and VS Code; 100 free records a month.

Art provenance intelligence: 282,731-node knowledge graph over Getty Provenance Index, Knoedler stock books, and wartime-restitution records — every answer cited, custody gaps named. Free keyless remote: https://provenio.art/api/mcp

Puley lets your AI read web pages, get video transcripts where available, turn pages into tables, compare prices across countries, and watch for changes. Connect a free Puley account. Alerts arrive by email and in-app.

Open compute-pricing reference — daily GPU and inference-token medians, free under CC-BY 4.0.