MCP servers
MCP servers let AI assistants such as Claude, ChatGPT and Cursor use outside tools and data. 6,681 servers so far, found in the official MCP registry, GitHub and npm. Each fact links to where we read it.
- OkapiBreaking changes of third-party APIs: check your code's API calls before they break.
- Oktio.appInstagram analytics, media kits, bio link and brand deals for creators, from your AI assistant.
- OlharySearch Brazil's public tenders, check company sanctions and find catalog codes on Olhary.
- Olothea — Collective Mind & Human–AI ResearchEmerging human–AI knowledge network: shared research, collective intelligence and peer review.
- Oman Payments (Tap Payments — cards / Apple Pay)Oman payments for AI agents — cards / Apple Pay via Tap Payments. Never holds funds.
- OmniaAuto — Canadian Vehicle ListingsLive Canadian vehicle listings, VIN decode and market valuations, province by province.
- One's VibeSearch a curated gallery of live, tryable AI-built products for prior art. Read-only, no auth.
- OneDroid EngramVersioned agent memory in your own Postgres: portable context, permissioned, audit trail.
- OneSchema MCP ServerMCP server that lets AI assistants use all OneSchema features exposed via the public API.
- OnhandFree local shop search, no sign-in: addresses, hours, contacts and source-labelled offering details.
- Online-Druck.biz (ODB) – Druckprodukte / Print productsDruckprodukte suchen, konfigurieren, bepreisen / Search, configure, price print products
- OnlineFitness.appManage fitness coaching clients, workouts, programs, chats and funnels from your assistant.
- OnlyFontsFind free, openly licensed fonts by style, use or language, and get the CSS to use them.
- OnsaFind scored B2B leads, read campaign replies and send approved LinkedIn outreach.
- OnsombleTrack how AI assistants talk about your brand and market, and learn how to show up better.
- Open PaddockFind motorcycle track days in the US, Canada and Mexico by place, date, circuit or organiser.
- Open SolidBanking for AI agents: wallet, US bank account, prepaid cards, and Venmo, PayPal, and bank payouts.
- OpenCancerCancer patient expert: NCCN-grounded answers with sources, recruiting trials, and expert review.
- OpenClipTurn long videos into short, captioned viral clips from your AI assistant. 28 tools, OAuth.
- OpenDealer MCP ServerAutomotive inventory search for AI assistants: vehicles, dealers, deals, and market data.
- OpenDocsWrite, organize and publish documentation sites, help centers and SOPs on OpenDocs.cloud.
- OpenDocs.ccPublish Markdown as shareable documents, export PDF and Word, share, and send for e-signature.
- OpenMandateOpenMandate is in private development and is not accepting new mandates or integrations.
- OpenMarkBenchmark your own prompt on 100+ LLMs with real API calls; pick the cheapest model that passes.
- OpenPrefsOne place for your preferences, portable across every AI assistant and agent.
- OpeningsSearch jobs on verified employer job boards. Every link is the employer's own posting.
- Opinion AlphaStock calls from finance influencers, linked to source and scored. Free with an account.
- OpinlySEO, competitor and AI-search data, plus blog management — draft, schedule and publish posts.
- OpperEU AI gateway: search 700+ models, create projects and API keys, manage rules, usage and traces.
- OptibotAI code review for your AI assistant — review local changes, branch diffs, and patch files.
- OptionscannerFree options calculators and the Optionscanner Learn library for any AI assistant. No account.
- OptuxCreate and run A/B tests, patches, split tests and feature flags on your website
- OrangeProFind test gaps, generate grounded tests, and dynamically prove behavior with mutation testing.
- OrbiloCheck whether a website is ready for AI agents (UCP, WebMCP, Access) and monitor your own sites.
- OrbitTurn any task into the right API calls: discover, evaluate, and integrate public APIs.
- Orbit CRMOpen-source CRM for AI agents: humans, orgs, interactions, deals, tasks, links and an activity log.
- OrckaiYour company's AI assistants, agents, workflows and knowledge bases from Orckai, as MCP tools.
- Order GroupSend a software project enquiry to Order Group and browse its case studies (fintech, energy, IoT).
- OrganicusYour brand's visibility in AI assistants: audit findings, weekly answers, and work to approve.
- Organize with AISearch photos/videos; manage collections, people and duplicates. Requires paid OwAI Cloud Access.
- Orion Celestia IntelCelestia network intelligence for AI agents: daily analysis, anomaly signals and DA metrics.
- OrionBIQuery your own databases and Data Sets with read-only SQL, and build hosted dashboards.
- OrisuBuild and run AI image, video and on-brand ad workflows from chat, with brand kits and share links.
- OrkestraTasks, org memory, impact simulations, docs, deploys and pull requests from the Orkestra suite.
- Orq.aiBuild and monitor LLM apps on Orq.ai: AI gateway, agents, prompts, evals, traces.
- OrtakListeShared lists with no sign-up: ready-made lists and recipes, and pre-filled links to share.
- OsmO Phone CallsAI makes phone calls for you and answers your calls. Free to start in US, Canada, UK, Australia.
- OstorlabQuery and act on your Ostorlab scans, vulnerabilities, tickets and assets.
- OutcometRead customer feedback, problems and initiatives in Outcomet, and log new feedback from chat.
- Outdoor Kitchen DesignerPlan a built-in grill and outdoor kitchen: real MSRP, priced layouts, 3D renders and dealer quotes.
- OutreachGenie WorkspaceLinkedIn prospecting for AI agents: lists, outreach flows, and campaigns in OutreachGenie.
- Outtake FlashTells your agent if a link is safe before it clicks, signs in or pays.
- Ouzap — WhatsApp for agentsRead, reply to and schedule WhatsApp messages from your Ouzap number. Made in Brazil.
- OverloadLog food and workouts in Overload from ChatGPT or Claude, then ask about your training and diet.
- OwlX AI Agent — Trading IntelligenceAI trading coach for crypto: structure scores, MemeSniper, token & stock financials. Education only.
- Own Your AIAI tools that run on your own machine: what each does, installs like, and costs.
- Own Your Mind DeAI assessmentsSigned, independent scores and claim checks for decentralised AI projects. Read-only, no auth.
- OwndyLook up and add the things you own: items, prices, receipts, warranties, serial numbers and totals.
- OyehYour AI sends a plan or a question to a friend's AI and brings the answer back. Friends only.
- PERM TrackerPERM, prevailing wage and H-1B case status, DOL's queue and the visa bulletin, from federal records
