"Free APIs and services without commercial fees" matching MCP servers:

Enables local, read-only access to IE Blackboard, IE Connects, and IE Careers within AI assistants, with 49 tools for deadlines, readings, events, grades, internships, and more.

Perfume database API with verified notes: 1,500+ perfumes, 160+ houses, 400+ raw materials in a fragrance ingredients database. 12 tools over MCP and REST, OpenAPI spec, free and keyless, answers in 10 languages. Look up a note or raw material and get the perfumes that use it, or a perfume and get its full top, heart and base pyramid. Built by Scento.

Enables Claude and ChatGPT to share a single study-progress database for interview prep, coursework, and spaced repetition, with per-user data isolation and server-side SM-2 scheduling for due reviews and study plans.

A server for querying, practicing, and analyzing exam questions from Taiwan's national examinations, offering 20 tools including search, statute lookup, weak topic review, and readiness assessment.

A set of tools enabling AI agents to interact with Canvas LMS, allowing users to find relevant resources, get course information, and navigate modules through natural language queries.

Enables bidirectional lookup of Mi'kmaq and English words with definitions and examples, and provides tools for learning and dictionary statistics, integrating seamlessly with AI-powered IDEs.

Free, no-key MCP server for reading scripture from 35+ public-domain translations in 8 languages. Lets users fetch verses, chapters, and passages via natural language from any MCP client.

Enables querying Schoox LMS data (users, courses, enrollments, etc.) via natural language using AI assistants, without writing API code.

Read-only MCP server providing Wealthi's AI Coach with scoped access to student progress data from Firestore and Supabase, enabling AI to retrieve student profiles, progress, assessment results, and learning signals without direct database credentials.

Enables MCP-capable agents to inspect a local Synthesizer installation, query local grids and APIs, find examples, plot grid spectra, and validate scripts, so answers are grounded in the user's actual environment.

Helps independent inventors calculate USPTO fees, determine entity status, track patent deadlines, and understand procedural rules without needing an attorney.

Enables MCP clients to search and read the free AI School curriculum, including 550+ tracks on AI engineering, governance, security, and applied AI by profession.

Enables integration with LeetCode APIs to retrieve problems, contests, solutions, and user data, support daily challenges and advanced searches, and perform authenticated actions such as running or submitting code and managing notes.

Local MCP voice coach that provides English pronunciation, grammar, and fluency feedback from microphone recordings. It supports free-form voice conversation, focused practice drills, phoneme-level feedback, prosody hints, and learner-profile guidance.

A minimal Model Context Protocol server built with the official Python SDK. It exposes one tool, define, which looks up the definition of an English word using the free dictionaryapi.dev API.

Enables AI agents to conjugate verbs in 14 European languages via a hosted Rust API, requiring only a free API key.

Enables AI assistants to search and read Materio's educational PDF resources directly, without manual file uploads.

Enables searching and browsing TU Berlin degree programs and modules from Moses' public Modulverzeichnis, including module details, exam types, and cross-program usage, without requiring login.

MCP server providing U.S. college ROI data (30-year NPV, major ROI, best-value rankings, and out-of-state tuition penalty) by wrapping a free, keyless API.

Search real, source-checked kids' events, classes and places across 42 US metro areas from Grassy Knees: this weekend's events, free-only and age filters, listing details and seasonal guides, each with its official link and last-checked date.

Enables read-only querying of Moodle as a student, including courses, assignments, grades, forums, and files, using a personal web services token.

Render music notation from a JSON score to inline SVG (Verovio + Bravura), round-trippable MusicXML, and base64 MIDI in one call. Includes pre-flight validation with concrete fix suggestions and a curated music-theory knowledge search. Free, open, no auth, sponsored by Gradus School of Music Composition.

Enables AI assistants to query HSE University's RUZ schedule API: find students, lecturers, groups, and rooms by substring, and retrieve a student's schedule by corporate email or a group's schedule by ID for 1–60 days ahead. Works without login or browser, though only from the HSE campus network or staff VPN.

Exposes USC's public course catalog API to AI agents, enabling natural-language queries about courses, GE requirements, schedules, and fees with optional filters for days, times, and open sections.

Enables AI agents to search and read the public Faradars course catalog, including prices, discounts, syllabi, reviews, instructors, categories, learning paths, offers, and magazine articles, without an API key or account.

Enables AI agents to access live aviation data including METAR weather, airport information, aircraft specs, an aviation glossary, and FAA-style practice questions via the free Rotate Pilot API.

Enables turning pasted syllabus text into dated calendar events, expanding recurring classes while skipping holidays and reading weeks, building valid .ics files with reminders, and merging calendars to surface conflicts. All processing runs locally without login or network access.

Enables read-only searching of HISinOne campus portals for courses and details without login, plus retrieval of personal timetable and grade overviews through an existing hisinone-cli session.

Enables users to find free legal textbook copies by title, ISBN, or course topic across OpenStax, DOAB, and Open Library, look up ISBN edition details, browse free textbooks by subject, and identify older editions that may cost less.

An MCP server for designing environmental education lessons using built-in Korean curriculum standards, resource catalogs, and full-text document search, enabling teachers to collaboratively plan lessons with AI without external subscriptions.