"Free PostgreSQL Database Solutions" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
AI receptionist for US businesses: free test line, then 25c a minute. Meeting notes, video formats.
8 curriculum, classroom, accommodations and exam-prep skill products. 5 of 7 free.
Tools for AI agents preparing Russian business documents: validates INN, KPP, OGRN, BIC and bank accounts by checksum, writes amounts in Russian words with VAT, declines Russian names and job titles by case, and counts working days by the official Russian calendar. Free, no API key.
Deterministic PDF tools for AI agents: inspect AcroForm fields, fill forms, merge PDFs and generate invoices. Hosted endpoint; tool calls need a free API key from pdfops.dev.
Create, edit, share and render real-time collaborative diagrams and mindmaps on livediagram.app. Describe flowcharts, architecture, org charts or mind maps as nodes and edges (or Mermaid) and the server lays them out. Free and open source.
FirmLedger: search and verify businesses. Free needs no key; Pro adds contacts, news, jobs.
Free hosted MCP server that connects ChatGPT and Claude (claude.ai, Claude Code) to multiple Gmail, Google Calendar, Google Drive (read-only) and Google Contacts accounts, Slack workspaces and Notion through one connection URL. Search, read and act across every connected account at once, with a memory shared across your AI assistants. OAuth sign-in. Outlook / Microsoft 365 are not supported.
Connect any AI assistant to Odoo 16-19 via OAuth 2.0 + PKCE. 400 free calls, no local install. Plans from 9/mo.
AgenticBooks is agent-native financial infrastructure. An agent can open an account, connect a user's payment and banking sources, and read back clean, reconciled accounting books over MCP. No human in the loop and free to start.
DeepMark helps teachers deliver rapid, consistent marking with meaningful feedback for every student — in a fraction of the time. What once took a week, now takes one free period.
Over 200 free UK-focused calculators, converters and generators as MCP tools: take-home pay and National Insurance for 2026/27, VAT, stamp duty, mortgages, loans, savings, inflation since 1988, currency with live rates, dates and working days with bank holidays, unit conversions, health calculators, colour and text utilities, encoding, hashing, JWT and TOTP, and validators for IBANs and Bitcoin and Ethereum addresses. Every tool is read-only, stateless and computes on the spot; nothing you send is stored. Each result links to its source page on hopi.co.uk.
- KeeploopOAuthapp.keeploop
Mail, Calendar, Messages, Notes, Contacts, Slack on your Mac for AI. Remote needs Pro or free trial.
Turn any video or audio recording into text your AI can read, summarize and search. Say "transcribe my video", drop the file on the private link, and your AI reads the transcript. Free plan, nothing to install.
- CobrainOAuthspace.cobrain
Cobrain is a hosted Markdown brain your AIs share. Connect Claude, ChatGPT, Claude Code, Codex or any MCP client once (remote MCP with OAuth, no API keys to paste) and they all read and write the same notes. Share one folder with a teammate, read-only or read-write, and their AI reads it too. Permissions are enforced in the database, the same for the web app and for AIs; writes are version-checked so two AIs can't silently overwrite each other. Plain .md, exportable, EU-hosted. Free plan available.
MCP server for Cronofy — read calendars, events and free/busy, and create, update or delete events.
Weekly client reports: accomplishments, hours, blockers. Free.
Free scheduling your agent can book through: live availability, booking, verification, cancel.
Lim | The Ultimate Workspace: Free Alternative to AI supports chats, notes, docs, sites, reports, and MCP links across 33 pages.
Free no-signup group scheduling describe a plan, share a link, rank times by who's free. Public MCP for AI assistants.
Send PDFs for legally binding electronic signature, free and unlimited. Tools to send documents with emailed signing links, track per-recipient signing status, and use free legal templates (NDA, lease, contractor agreement, and more) sendable by URL.
